diff mbox

[v3,02/12] binfmt_flat: convert printk invocations to their modern form

Message ID 1468988424-32671-3-git-send-email-nicolas.pitre@linaro.org
State Superseded
Headers show

Commit Message

Nicolas Pitre July 20, 2016, 4:20 a.m. UTC 
Signed-off-by: Nicolas Pitre <nico@linaro.org>

---
 fs/binfmt_flat.c | 118 ++++++++++++++++++++++++-------------------------------
 1 file changed, 51 insertions(+), 67 deletions(-)

-- 
2.7.4

Comments

Nicolas Pitre July 20, 2016, 5:05 a.m. UTC | #1 
On Tue, 19 Jul 2016, Joe Perches wrote:

> On Wed, 2016-07-20 at 00:20 -0400, Nicolas Pitre wrote:

> > diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c

> []

> > @@ -15,6 +15,8 @@

> >   *	JAN/99 -- coded full program relocation (gerg@snapgear.com)

> >   */

> >  

> > +#define pr_fmt(fmt)	"BINFMT_FLAT: : " fmt

> 

> Why the double colon?


Go figure.

> Much more common would be

> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt


Sure. I used the all-caps version as that's what most former printk's 
used. But if you say KBUILD_MODNAME is more common then I have no issue 
with that.

> 

> > @@ -106,8 +98,8 @@ static struct linux_binfmt flat_format = {

> >  

> >  static int flat_core_dump(struct coredump_params *cprm)

> >  {

> > -	printk("Process %s:%d received signr %d and should have core dumped\n",

> > -			current->comm, current->pid, cprm->siginfo->si_signo);

> > +	pr_warning("Process %s:%d received signr %d and should have core dumped\n",

> > +		   current->comm, current->pid, cprm->siginfo->si_signo);

> 

> Prefer pr_warn


OK.

Updated in my repo and pushed out.

> >  	return(1);

> >  }

> >  

> > @@ -190,17 +182,17 @@ static int decompress_exec(

> >  	loff_t fpos;

> >  	int ret, retval;

> >  

> > -	DBG_FLT("decompress_exec(offset=%lx,buf=%p,len=%lx)\n",offset, dst, len);

> > +	pr_debug("decompress_exec(offset=%lx,buf=%p,len=%lx)\n",offset, dst, len);

> 

> Generally unnecessary as the function tracer works well


Not necessarily on uClinux where you might not aford it.

And this patch is about converting existing printk()'s so if some of 
them should be removed then it would be best to do that separately.

> >  	memset(&strm, 0, sizeof(strm));

> >  	strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);

> >  	if (strm.workspace == NULL) {

> > -		DBG_FLT("binfmt_flat: no memory for decompress workspace\n");

> > +		pr_debug("no memory for decompress workspace\n");

> >  		return -ENOMEM;

> >  	}

> >  	buf = kmalloc(LBUFSIZE, GFP_KERNEL);

> >  	if (buf == NULL) {

> > -		DBG_FLT("binfmt_flat: no memory for read buffer\n");

> > +		pr_debug("no memory for read buffer\n");

> 

> Unnecessary OOM messages as allocs do a stack dump


Again this should probably be done separately.


Nicolas
diff mbox

Patch

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 085059d879..36f5bb6b2c 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -15,6 +15,8 @@ 
  *	JAN/99 -- coded full program relocation (gerg@snapgear.com)
  */
 
+#define pr_fmt(fmt)	"BINFMT_FLAT: : " fmt
+
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
@@ -44,16 +46,6 @@ 
 
 /****************************************************************************/
 
-#if 0
-#define DEBUG 1
-#endif
-
-#ifdef DEBUG
-#define	DBG_FLT(a...)	printk(a)
-#else
-#define	DBG_FLT(a...)
-#endif
-
 /*
  * User data (data section and bss) needs to be aligned.
  * We pick 0x20 here because it is the max value elf2flt has always
@@ -106,8 +98,8 @@  static struct linux_binfmt flat_format = {
 
 static int flat_core_dump(struct coredump_params *cprm)
 {
-	printk("Process %s:%d received signr %d and should have core dumped\n",
-			current->comm, current->pid, cprm->siginfo->si_signo);
+	pr_warning("Process %s:%d received signr %d and should have core dumped\n",
+		   current->comm, current->pid, cprm->siginfo->si_signo);
 	return(1);
 }
 
@@ -190,17 +182,17 @@  static int decompress_exec(
 	loff_t fpos;
 	int ret, retval;
 
-	DBG_FLT("decompress_exec(offset=%lx,buf=%p,len=%lx)\n",offset, dst, len);
+	pr_debug("decompress_exec(offset=%lx,buf=%p,len=%lx)\n",offset, dst, len);
 
 	memset(&strm, 0, sizeof(strm));
 	strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
 	if (strm.workspace == NULL) {
-		DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
+		pr_debug("no memory for decompress workspace\n");
 		return -ENOMEM;
 	}
 	buf = kmalloc(LBUFSIZE, GFP_KERNEL);
 	if (buf == NULL) {
-		DBG_FLT("binfmt_flat: no memory for read buffer\n");
+		pr_debug("no memory for read buffer\n");
 		retval = -ENOMEM;
 		goto out_free;
 	}
@@ -218,25 +210,25 @@  static int decompress_exec(
 
 	/* Check minimum size -- gzip header */
 	if (ret < 10) {
-		DBG_FLT("binfmt_flat: file too small?\n");
+		pr_debug("file too small?\n");
 		goto out_free_buf;
 	}
 
 	/* Check gzip magic number */
 	if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
-		DBG_FLT("binfmt_flat: unknown compression magic?\n");
+		pr_debug("unknown compression magic?\n");
 		goto out_free_buf;
 	}
 
 	/* Check gzip method */
 	if (buf[2] != 8) {
-		DBG_FLT("binfmt_flat: unknown compression method?\n");
+		pr_debug("unknown compression method?\n");
 		goto out_free_buf;
 	}
 	/* Check gzip flags */
 	if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
 	    (buf[3] & RESERVED)) {
-		DBG_FLT("binfmt_flat: unknown flags?\n");
+		pr_debug("unknown flags?\n");
 		goto out_free_buf;
 	}
 
@@ -244,7 +236,7 @@  static int decompress_exec(
 	if (buf[3] & EXTRA_FIELD) {
 		ret += 2 + buf[10] + (buf[11] << 8);
 		if (unlikely(LBUFSIZE <= ret)) {
-			DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
+			pr_debug("buffer overflow (EXTRA)?\n");
 			goto out_free_buf;
 		}
 	}
@@ -252,7 +244,7 @@  static int decompress_exec(
 		while (ret < LBUFSIZE && buf[ret++] != 0)
 			;
 		if (unlikely(LBUFSIZE == ret)) {
-			DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
+			pr_debug("buffer overflow (ORIG_NAME)?\n");
 			goto out_free_buf;
 		}
 	}
@@ -260,7 +252,7 @@  static int decompress_exec(
 		while (ret < LBUFSIZE && buf[ret++] != 0)
 			;
 		if (unlikely(LBUFSIZE == ret)) {
-			DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
+			pr_debug("buffer overflow (COMMENT)?\n");
 			goto out_free_buf;
 		}
 	}
@@ -273,7 +265,7 @@  static int decompress_exec(
 	strm.total_out = 0;
 
 	if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
-		DBG_FLT("binfmt_flat: zlib init failed?\n");
+		pr_debug("zlib init failed?\n");
 		goto out_free_buf;
 	}
 
@@ -290,7 +282,7 @@  static int decompress_exec(
 	}
 
 	if (ret < 0) {
-		DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
+		pr_debug("decompression failed (%d), %s\n",
 			ret, strm.msg);
 		goto out_zlib;
 	}
@@ -327,24 +319,23 @@  calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
 		r &= 0x00ffffff;	/* Trim ID off here */
 	}
 	if (id >= MAX_SHARED_LIBS) {
-		printk("BINFMT_FLAT: reference 0x%x to shared library %d",
-				(unsigned) r, id);
+		pr_err("reference 0x%lx to shared library %d", r, id);
 		goto failed;
 	}
 	if (curid != id) {
 		if (internalp) {
-			printk("BINFMT_FLAT: reloc address 0x%x not in same module "
-					"(%d != %d)", (unsigned) r, curid, id);
+			pr_err("reloc address 0x%lx not in same module "
+			       "(%d != %d)", r, curid, id);
 			goto failed;
 		} else if ( ! p->lib_list[id].loaded &&
 				load_flat_shared_library(id, p) < 0) {
-			printk("BINFMT_FLAT: failed to load library %d", id);
+			pr_err("failed to load library %d", id);
 			goto failed;
 		}
 		/* Check versioning information (i.e. time stamps) */
 		if (p->lib_list[id].build_date && p->lib_list[curid].build_date &&
 				p->lib_list[curid].build_date < p->lib_list[id].build_date) {
-			printk("BINFMT_FLAT: library %d is younger than %d", id, curid);
+			pr_err("library %d is younger than %d", id, curid);
 			goto failed;
 		}
 	}
@@ -358,7 +349,7 @@  calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
 	text_len = p->lib_list[id].text_len;
 
 	if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
-		printk("BINFMT_FLAT: reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
+		pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
 		       r, start_brk-start_data+text_len, text_len);
 		goto failed;
 	}
@@ -372,7 +363,7 @@  calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
 	return(addr);
 
 failed:
-	printk(", killing %s!\n", current->comm);
+	pr_cont(", killing %s!\n", current->comm);
 	send_sig(SIGSEGV, current, 0);
 
 	return RELOC_FAILED;
@@ -382,9 +373,7 @@  failed:
 
 static void old_reloc(unsigned long rl)
 {
-#ifdef DEBUG
 	static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
-#endif
 	flat_v2_reloc_t	r;
 	unsigned long *ptr;
 	
@@ -395,11 +384,9 @@  static void old_reloc(unsigned long rl)
 	ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset);
 #endif
 
-#ifdef DEBUG
-	printk("Relocation of variable at DATASEG+%x "
-		"(address %p, currently %lx) into segment %s\n",
-		r.reloc.offset, ptr, *ptr, segment[r.reloc.type]);
-#endif
+	pr_debug("Relocation of variable at DATASEG+%x "
+		 "(address %p, currently %lx) into segment %s\n",
+		 r.reloc.offset, ptr, *ptr, segment[r.reloc.type]);
 	
 	switch (r.reloc.type) {
 	case OLD_FLAT_RELOC_TYPE_TEXT:
@@ -412,13 +399,11 @@  static void old_reloc(unsigned long rl)
 		*ptr += current->mm->end_data;
 		break;
 	default:
-		printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type);
+		pr_err("Unknown relocation type=%x\n", r.reloc.type);
 		break;
 	}
 
-#ifdef DEBUG
-	printk("Relocation became %lx\n", *ptr);
-#endif
+	pr_debug("Relocation became %lx\n", *ptr);
 }		
 
 /****************************************************************************/
@@ -467,20 +452,19 @@  static int load_flat_file(struct linux_binprm * bprm,
 	}
 
 	if (flags & FLAT_FLAG_KTRACE)
-		printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
+		pr_info("Loading file: %s\n", bprm->filename);
 
 	if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
-		printk("BINFMT_FLAT: bad flat file version 0x%x (supported "
-			"0x%lx and 0x%lx)\n",
-			rev, FLAT_VERSION, OLD_FLAT_VERSION);
+		pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
+		       rev, FLAT_VERSION, OLD_FLAT_VERSION);
 		ret = -ENOEXEC;
 		goto err;
 	}
 	
 	/* Don't allow old format executables to use shared libraries */
 	if (rev == OLD_FLAT_VERSION && id != 0) {
-		printk("BINFMT_FLAT: shared libraries are not available before rev 0x%lx\n",
-				FLAT_VERSION);
+		pr_err("shared libraries are not available before rev 0x%lx\n",
+		       FLAT_VERSION);
 		ret = -ENOEXEC;
 		goto err;
 	}
@@ -494,7 +478,7 @@  static int load_flat_file(struct linux_binprm * bprm,
 
 #ifndef CONFIG_BINFMT_ZFLAT
 	if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
-		printk("Support for ZFLAT executables is not enabled.\n");
+		pr_err("Support for ZFLAT executables is not enabled.\n");
 		ret = -ENOEXEC;
 		goto err;
 	}
@@ -540,7 +524,7 @@  static int load_flat_file(struct linux_binprm * bprm,
 		 * this should give us a ROM ptr,  but if it doesn't we don't
 		 * really care
 		 */
-		DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
+		pr_debug("ROM mapping of file (we hope)\n");
 
 		textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
 				  MAP_PRIVATE|MAP_EXECUTABLE, 0);
@@ -548,7 +532,7 @@  static int load_flat_file(struct linux_binprm * bprm,
 			ret = textpos;
 			if (!textpos)
 				ret = -ENOMEM;
-			printk("Unable to mmap process text, errno %d\n", ret);
+			pr_err("Unable to mmap process text, errno %d\n", ret);
 			goto err;
 		}
 
@@ -561,7 +545,7 @@  static int load_flat_file(struct linux_binprm * bprm,
 			ret = realdatastart;
 			if (!realdatastart)
 				ret = -ENOMEM;
-			printk("Unable to allocate RAM for process data, "
+			pr_err("Unable to allocate RAM for process data, "
 			       "errno %d\n", ret);
 			vm_munmap(textpos, text_len);
 			goto err;
@@ -570,8 +554,8 @@  static int load_flat_file(struct linux_binprm * bprm,
 				MAX_SHARED_LIBS * sizeof(unsigned long),
 				FLAT_DATA_ALIGN);
 
-		DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%ld bytes): %lx\n",
-			data_len + bss_len + stack_len, datapos);
+		pr_debug("Allocated data+bss+stack (%ld bytes): %lx\n",
+			 data_len + bss_len + stack_len, datapos);
 
 		fpos = ntohl(hdr->data_start);
 #ifdef CONFIG_BINFMT_ZFLAT
@@ -586,7 +570,7 @@  static int load_flat_file(struct linux_binprm * bprm,
 		}
 		if (IS_ERR_VALUE(result)) {
 			ret = result;
-			printk("Unable to read data+bss, errno %d\n", ret);
+			pr_err("Unable to read data+bss, errno %d\n", ret);
 			vm_munmap(textpos, text_len);
 			vm_munmap(realdatastart, len);
 			goto err;
@@ -607,7 +591,7 @@  static int load_flat_file(struct linux_binprm * bprm,
 			ret = textpos;
 			if (!textpos)
 				ret = -ENOMEM;
-			printk("Unable to allocate RAM for process text/data, "
+			pr_err("Unable to allocate RAM for process text/data, "
 			       "errno %d\n", ret);
 			goto err;
 		}
@@ -650,7 +634,7 @@  static int load_flat_file(struct linux_binprm * bprm,
 		}
 		if (IS_ERR_VALUE(result)) {
 			ret = result;
-			printk("Unable to read code+data+bss, errno %d\n", ret);
+			pr_err("Unable to read code+data+bss, errno %d\n", ret);
 			vm_munmap(textpos, text_len + data_len + extra +
 				MAX_SHARED_LIBS * sizeof(unsigned long));
 			goto err;
@@ -680,12 +664,12 @@  static int load_flat_file(struct linux_binprm * bprm,
 	}
 
 	if (flags & FLAT_FLAG_KTRACE) {
-		printk("Mapping is %lx, Entry point is %x, data_start is %x\n",
-		       textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start));
-		printk("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n",
-		       id ? "Lib" : "Load", bprm->filename,
-		       start_code, end_code, datapos, datapos + data_len,
-		       datapos + data_len, (datapos + data_len + bss_len + 3) & ~3);
+		pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n",
+			textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start));
+		pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n",
+			id ? "Lib" : "Load", bprm->filename,
+			start_code, end_code, datapos, datapos + data_len,
+			datapos + data_len, (datapos + data_len + bss_len + 3) & ~3);
 	}
 
 	/* Store the current module values into the global library structure */
@@ -893,7 +877,7 @@  static int load_flat_binary(struct linux_binprm * bprm)
 	set_binfmt(&flat_format);
 
 	p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
-	DBG_FLT("p=%lx\n", p);
+	pr_debug("p=%lx\n", p);
 
 	/* copy the arg pages onto the stack, this could be more efficient :-) */
 	for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--)
@@ -925,8 +909,8 @@  static int load_flat_binary(struct linux_binprm * bprm)
 	FLAT_PLAT_INIT(regs);
 #endif
 
-	DBG_FLT("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n",
-		regs, start_addr, current->mm->start_stack);
+	pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n",
+		 regs, start_addr, current->mm->start_stack);
 	start_thread(regs, start_addr, current->mm->start_stack);
 
 	return 0;