From patchwork Sat Jul 15 13:52:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 703227 Delivered-To: patch@linaro.org Received: by 2002:a5d:4e4d:0:b0:314:25da:8dc4 with SMTP id r13csp157453wrt; Sat, 15 Jul 2023 06:56:20 -0700 (PDT) X-Google-Smtp-Source: APBJJlETaobs90aGpdYb71U11ZZQIaSdthhygk1BizvlNru2A5zuPBof2VfBIcpn7xcilfHTXg3J X-Received: by 2002:a05:622a:11c1:b0:403:af9b:ee8e with SMTP id n1-20020a05622a11c100b00403af9bee8emr8698256qtk.9.1689429380451; Sat, 15 Jul 2023 06:56:20 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1689429380; cv=none; d=google.com; s=arc-20160816; b=GlzHtvFM4eHuXxF4VSg+4Kno8F/O39+Uq9G8g5rmwloBEs74dYhZZP4mKBxBuXXvSI 6yhuwykP5hzb7XJPq5bOh5wwy4ea1lIJAFxKRGsaj/CZOEQ/LIB2HXeh/qQYxxsFRHq0 8TWY/+kkDZp47D7Og/R9UNXA1dRhNBcbBuutF4a/1fB3JRhx+GSXodr2Sw4//xQnqGfU f3tJVNn0o9Har5df7+MTsif6/ANDOXOfPde3I0tZxj97EUgrxMD7vN+qTs1vHBPDmlnH o6MDrfzilMyuwufBErtp4iBOKRHnRrkExmvMe7vVMOQzPvXYP8UMdrrDeTNpAHAK1ZYD aDkQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=2MU6soREEIeWjjQLlmK8RHmCnAP0c3qo3FFfRalqkkk=; fh=P0V/Y70HKiPuHhoCuPJxmK0kQFpmXwOOVIu7VqYXDLE=; b=PHYulMjJu3Yle7zaa0JPf2OsR9q0lWvJ7iS66xOSSPfRRn1I8Jd7t61pOz0gIgMPOO k1YxqEL9U87pmy+qNm+UKR7ZkEwB8qC0qP549obrigWha0WccPQiJWNVXo1bPtm8S+YJ iXAUzLJgULuYmov18mKfq+Ot9h9906pxpy8TNhxS5gKplJ0DwpT3bNHimbA/2BhVT6C7 bn9Iuv+sJ4nJWKuErW0wf0o7Xwvef/536YaBwSAVPHtKX66aguvcXXdTN020lIcnpvq1 2HI1ARnhxDLpLzRt9NA9U3kVgs6ytPo0JtR8KJ09NL9a6mQcs7qDW8LMuKjMIWvNh6N8 uI8g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=jKdR8IJJ; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org. [209.51.188.17]) by mx.google.com with ESMTPS id j18-20020ac85f92000000b00403a7a5820fsi5883713qta.142.2023.07.15.06.56.20 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sat, 15 Jul 2023 06:56:20 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=jKdR8IJJ; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qKfjp-0007Kv-PT; Sat, 15 Jul 2023 09:55:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qKfiP-00045g-NK for qemu-devel@nongnu.org; Sat, 15 Jul 2023 09:53:43 -0400 Received: from mail-wr1-x434.google.com ([2a00:1450:4864:20::434]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qKfiM-0001Hp-8T for qemu-devel@nongnu.org; Sat, 15 Jul 2023 09:53:40 -0400 Received: by mail-wr1-x434.google.com with SMTP id ffacd0b85a97d-307d20548adso2876502f8f.0 for ; Sat, 15 Jul 2023 06:53:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1689429216; x=1692021216; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=2MU6soREEIeWjjQLlmK8RHmCnAP0c3qo3FFfRalqkkk=; b=jKdR8IJJYg+ppWH/oXqnn/VcvQLdjfiprMbvBqVsWzoBdEECMsNmxb35Q59wmbZQH0 fSHIabpon+WE/2sMMThsHL6CDroIclrQlhxc4zJT/nyXUZKgut0871pUBuFNILfoD5/x rhBDSYMfuPYWrOwY9EahxuFEO0jb7H6al01PugL5AgZ7jVhg8qrdREGeKuHxuZIVD1Hk uhSotfrPk6kFAsWPowoO3vNQ0kHPEQTu1UvFaMbym095YPQU+g10iQ0aS7aF6r7ZHFwU gt7hczq1TSJ1muTaLV0+oWt8oZhmCnqFVpV9i7w4Z0dFUQQYbQt+bseXO0U6B0mSUOE9 DzBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689429216; x=1692021216; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2MU6soREEIeWjjQLlmK8RHmCnAP0c3qo3FFfRalqkkk=; b=CkS6UDg5BgOE5cdgF1v1e6lDejwJ4WA/EW7v3IIch/+wn1PeLhRI4MymIqAa/Nnh6y 7BCeZPkAwyjoa04F+fZ1GIjMF/2iNqFIs+8jD/+UltuEDdH5OZlS0Rc575OcZyQl1W4b 4UkgPKtjkNzUN63ynyhS6uW6KzHzhKdrM9bpKDJ2/p5UO4rIl+ghhXrEDVkj0i+YhP2Q VbeA7I4kTaOm4WZVlPZH8k2yx0Vr1XkHTW2eO63h3g51XxGYRbHcsWdtx5ziCRrt1TRi Eq1sHN1oPVUUxFRJyiIqmxNj1FdtbRpFlBMHsLDuWmCMDwEzrevob7J6pEdojwrQVe9v R6LA== X-Gm-Message-State: ABy/qLblcrhoJ9qUwDF9UDMajQUisEEA5InVm1w69t6OUSsmHxb8sf6q 2O3+czlEHwgJho2UvpYAjS6GR2KPBqD3G+FSj/moNg== X-Received: by 2002:a5d:4dd0:0:b0:313:f8de:1ff6 with SMTP id f16-20020a5d4dd0000000b00313f8de1ff6mr6310278wru.51.1689429216529; Sat, 15 Jul 2023 06:53:36 -0700 (PDT) Received: from stoup.lan ([51.219.12.49]) by smtp.gmail.com with ESMTPSA id k10-20020a5d66ca000000b00313f9085119sm13838014wrw.113.2023.07.15.06.53.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Jul 2023 06:53:36 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: =?utf-8?q?Alex_Benn=C3=A9e?= , =?utf-8?q?Philipp?= =?utf-8?q?e_Mathieu-Daud=C3=A9?= Subject: [PULL 21/47] linux-user: Fix formatting of mmap.c Date: Sat, 15 Jul 2023 14:52:51 +0100 Message-Id: <20230715135317.7219-22-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230715135317.7219-1-richard.henderson@linaro.org> References: <20230715135317.7219-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::434; envelope-from=richard.henderson@linaro.org; helo=mail-wr1-x434.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org Fix all checkpatch.pl errors within mmap.c. Reviewed-by: Alex Bennée Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Richard Henderson Message-Id: <20230707204054.8792-5-richard.henderson@linaro.org> --- linux-user/mmap.c | 199 ++++++++++++++++++++++++++++------------------ 1 file changed, 122 insertions(+), 77 deletions(-) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 2692936773..639921dba0 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -56,10 +56,11 @@ void mmap_fork_start(void) void mmap_fork_end(int child) { - if (child) + if (child) { pthread_mutex_init(&mmap_mutex, NULL); - else + } else { pthread_mutex_unlock(&mmap_mutex); + } } /* @@ -203,40 +204,47 @@ static int mmap_frag(abi_ulong real_start, /* get the protection of the target pages outside the mapping */ prot1 = 0; - for(addr = real_start; addr < real_end; addr++) { - if (addr < start || addr >= end) + for (addr = real_start; addr < real_end; addr++) { + if (addr < start || addr >= end) { prot1 |= page_get_flags(addr); + } } if (prot1 == 0) { /* no page was there, so we allocate one */ void *p = mmap(host_start, qemu_host_page_size, prot, flags | MAP_ANONYMOUS, -1, 0); - if (p == MAP_FAILED) + if (p == MAP_FAILED) { return -1; + } prot1 = prot; } prot1 &= PAGE_BITS; prot_new = prot | prot1; if (!(flags & MAP_ANONYMOUS)) { - /* msync() won't work here, so we return an error if write is - possible while it is a shared mapping */ - if ((flags & MAP_TYPE) == MAP_SHARED && - (prot & PROT_WRITE)) + /* + * msync() won't work here, so we return an error if write is + * possible while it is a shared mapping. + */ + if ((flags & MAP_TYPE) == MAP_SHARED && (prot & PROT_WRITE)) { return -1; + } /* adjust protection to be able to read */ - if (!(prot1 & PROT_WRITE)) + if (!(prot1 & PROT_WRITE)) { mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE); + } /* read the corresponding file data */ - if (pread(fd, g2h_untagged(start), end - start, offset) == -1) + if (pread(fd, g2h_untagged(start), end - start, offset) == -1) { return -1; + } /* put final protection */ - if (prot_new != (prot1 | PROT_WRITE)) + if (prot_new != (prot1 | PROT_WRITE)) { mprotect(host_start, qemu_host_page_size, prot_new); + } } else { if (prot_new != prot1) { mprotect(host_start, qemu_host_page_size, prot_new); @@ -265,8 +273,10 @@ abi_ulong mmap_next_start = TASK_UNMAPPED_BASE; unsigned long last_brk; -/* Subroutine of mmap_find_vma, used when we have pre-allocated a chunk - of guest address space. */ +/* + * Subroutine of mmap_find_vma, used when we have pre-allocated + * a chunk of guest address space. + */ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size, abi_ulong align) { @@ -362,15 +372,17 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align) * - shmat() with SHM_REMAP flag */ ptr = mmap(g2h_untagged(addr), size, PROT_NONE, - MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0); + MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE, -1, 0); /* ENOMEM, if host address space has no memory */ if (ptr == MAP_FAILED) { return (abi_ulong)-1; } - /* Count the number of sequential returns of the same address. - This is used to modify the search algorithm below. */ + /* + * Count the number of sequential returns of the same address. + * This is used to modify the search algorithm below. + */ repeat = (ptr == prev ? repeat + 1 : 0); if (h2g_valid(ptr + size - 1)) { @@ -387,14 +399,18 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align) /* The address is not properly aligned for the target. */ switch (repeat) { case 0: - /* Assume the result that the kernel gave us is the - first with enough free space, so start again at the - next higher target page. */ + /* + * Assume the result that the kernel gave us is the + * first with enough free space, so start again at the + * next higher target page. + */ addr = ROUND_UP(addr, align); break; case 1: - /* Sometimes the kernel decides to perform the allocation - at the top end of memory instead. */ + /* + * Sometimes the kernel decides to perform the allocation + * at the top end of memory instead. + */ addr &= -align; break; case 2: @@ -407,8 +423,10 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align) break; } } else { - /* Since the result the kernel gave didn't fit, start - again at low memory. If any repetition, fail. */ + /* + * Since the result the kernel gave didn't fit, start + * again at low memory. If any repetition, fail. + */ addr = (repeat ? -1 : 0); } @@ -423,8 +441,10 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align) return (abi_ulong)-1; } wrapped = 1; - /* Don't actually use 0 when wrapping, instead indicate - that we'd truly like an allocation in low memory. */ + /* + * Don't actually use 0 when wrapping, instead indicate + * that we'd truly like an allocation in low memory. + */ addr = (mmap_min_addr > TARGET_PAGE_SIZE ? TARGET_PAGE_ALIGN(mmap_min_addr) : TARGET_PAGE_SIZE); @@ -485,8 +505,10 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, real_start = start & qemu_host_page_mask; host_offset = offset & qemu_host_page_mask; - /* If the user is asking for the kernel to find a location, do that - before we truncate the length for mapping files below. */ + /* + * If the user is asking for the kernel to find a location, do that + * before we truncate the length for mapping files below. + */ if (!(flags & MAP_FIXED)) { host_len = len + offset - host_offset; host_len = HOST_PAGE_ALIGN(host_len); @@ -497,32 +519,36 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, } } - /* When mapping files into a memory area larger than the file, accesses - to pages beyond the file size will cause a SIGBUS. - - For example, if mmaping a file of 100 bytes on a host with 4K pages - emulating a target with 8K pages, the target expects to be able to - access the first 8K. But the host will trap us on any access beyond - 4K. - - When emulating a target with a larger page-size than the hosts, we - may need to truncate file maps at EOF and add extra anonymous pages - up to the targets page boundary. */ - + /* + * When mapping files into a memory area larger than the file, accesses + * to pages beyond the file size will cause a SIGBUS. + * + * For example, if mmaping a file of 100 bytes on a host with 4K pages + * emulating a target with 8K pages, the target expects to be able to + * access the first 8K. But the host will trap us on any access beyond + * 4K. + * + * When emulating a target with a larger page-size than the hosts, we + * may need to truncate file maps at EOF and add extra anonymous pages + * up to the targets page boundary. + */ if ((qemu_real_host_page_size() < qemu_host_page_size) && !(flags & MAP_ANONYMOUS)) { struct stat sb; - if (fstat (fd, &sb) == -1) - goto fail; + if (fstat(fd, &sb) == -1) { + goto fail; + } - /* Are we trying to create a map beyond EOF?. */ - if (offset + len > sb.st_size) { - /* If so, truncate the file map at eof aligned with - the hosts real pagesize. Additional anonymous maps - will be created beyond EOF. */ - len = REAL_HOST_PAGE_ALIGN(sb.st_size - offset); - } + /* Are we trying to create a map beyond EOF?. */ + if (offset + len > sb.st_size) { + /* + * If so, truncate the file map at eof aligned with + * the hosts real pagesize. Additional anonymous maps + * will be created beyond EOF. + */ + len = REAL_HOST_PAGE_ALIGN(sb.st_size - offset); + } } if (!(flags & MAP_FIXED)) { @@ -532,9 +558,11 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, host_len = len + offset - host_offset; host_len = HOST_PAGE_ALIGN(host_len); - /* Note: we prefer to control the mapping address. It is - especially important if qemu_host_page_size > - qemu_real_host_page_size */ + /* + * Note: we prefer to control the mapping address. It is + * especially important if qemu_host_page_size > + * qemu_real_host_page_size. + */ p = mmap(g2h_untagged(start), host_len, host_prot, flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0); if (p == MAP_FAILED) { @@ -572,45 +600,52 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, goto fail; } - /* worst case: we cannot map the file because the offset is not - aligned, so we read it */ + /* + * worst case: we cannot map the file because the offset is not + * aligned, so we read it + */ if (!(flags & MAP_ANONYMOUS) && (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { - /* msync() won't work here, so we return an error if write is - possible while it is a shared mapping */ - if ((flags & MAP_TYPE) == MAP_SHARED && - (host_prot & PROT_WRITE)) { + /* + * msync() won't work here, so we return an error if write is + * possible while it is a shared mapping + */ + if ((flags & MAP_TYPE) == MAP_SHARED && (host_prot & PROT_WRITE)) { errno = EINVAL; goto fail; } retaddr = target_mmap(start, len, target_prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (retaddr == -1) + if (retaddr == -1) { goto fail; - if (pread(fd, g2h_untagged(start), len, offset) == -1) + } + if (pread(fd, g2h_untagged(start), len, offset) == -1) { goto fail; + } if (!(host_prot & PROT_WRITE)) { ret = target_mprotect(start, len, target_prot); assert(ret == 0); } goto the_end; } - + /* handle the start of the mapping */ if (start > real_start) { if (real_end == real_start + qemu_host_page_size) { /* one single host page */ ret = mmap_frag(real_start, start, end, host_prot, flags, fd, offset); - if (ret == -1) + if (ret == -1) { goto fail; + } goto the_end1; } ret = mmap_frag(real_start, start, real_start + qemu_host_page_size, host_prot, flags, fd, offset); - if (ret == -1) + if (ret == -1) { goto fail; + } real_start += qemu_host_page_size; } /* handle the end of the mapping */ @@ -619,8 +654,9 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, real_end - qemu_host_page_size, end, host_prot, flags, fd, offset + real_end - qemu_host_page_size - start); - if (ret == -1) + if (ret == -1) { goto fail; + } real_end -= qemu_host_page_size; } @@ -628,14 +664,16 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, if (real_start < real_end) { void *p; unsigned long offset1; - if (flags & MAP_ANONYMOUS) + if (flags & MAP_ANONYMOUS) { offset1 = 0; - else + } else { offset1 = offset + real_start - start; + } p = mmap(g2h_untagged(real_start), real_end - real_start, host_prot, flags, fd, offset1); - if (p == MAP_FAILED) + if (p == MAP_FAILED) { goto fail; + } passthrough_start = real_start; passthrough_end = real_end; } @@ -697,16 +735,18 @@ static void mmap_reserve(abi_ulong start, abi_ulong size) } end = real_end; } - if (prot != 0) + if (prot != 0) { real_start += qemu_host_page_size; + } } if (end < real_end) { prot = 0; for (addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { prot |= page_get_flags(addr); } - if (prot != 0) + if (prot != 0) { real_end -= qemu_host_page_size; + } } if (real_start != real_end) { mmap(g2h_untagged(real_start), real_end - real_start, PROT_NONE, @@ -722,8 +762,9 @@ int target_munmap(abi_ulong start, abi_ulong len) trace_target_munmap(start, len); - if (start & ~TARGET_PAGE_MASK) + if (start & ~TARGET_PAGE_MASK) { return -TARGET_EINVAL; + } len = TARGET_PAGE_ALIGN(len); if (len == 0 || !guest_range_valid_untagged(start, len)) { return -TARGET_EINVAL; @@ -737,25 +778,27 @@ int target_munmap(abi_ulong start, abi_ulong len) if (start > real_start) { /* handle host page containing start */ prot = 0; - for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) { + for (addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) { prot |= page_get_flags(addr); } if (real_end == real_start + qemu_host_page_size) { - for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { + for (addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { prot |= page_get_flags(addr); } end = real_end; } - if (prot != 0) + if (prot != 0) { real_start += qemu_host_page_size; + } } if (end < real_end) { prot = 0; - for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { + for (addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { prot |= page_get_flags(addr); } - if (prot != 0) + if (prot != 0) { real_end -= qemu_host_page_size; + } } ret = 0; @@ -798,8 +841,10 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, flags, g2h_untagged(new_addr)); if (reserved_va && host_addr != MAP_FAILED) { - /* If new and old addresses overlap then the above mremap will - already have failed with EINVAL. */ + /* + * If new and old addresses overlap then the above mremap will + * already have failed with EINVAL. + */ mmap_reserve(old_addr, old_size); } } else if (flags & MREMAP_MAYMOVE) {