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[bpf-next,v2,06/10] bpf: Bump MAX_BPF_STACK size to 768 bytes

Message ID 20210914123750.460750-7-memxor@gmail.com
State New
Headers show
Series Support kernel module function calls from eBPF | expand

Commit Message

Kumar Kartikeya Dwivedi Sept. 14, 2021, 12:37 p.m. UTC 
Increase the maximum stack size accessible to BPF program to 768 bytes.
This is done so that gen_loader can use 94 additional fds for kfunc BTFs
that it passes in to fd_array from the remaining space available for the
loader_stack struct to expand.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 include/linux/filter.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 4a93c12543ee..b214189ece62 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -82,8 +82,8 @@  struct ctl_table_header;
  */
 #define BPF_SYM_ELF_TYPE	't'
 
-/* BPF program can access up to 512 bytes of stack space. */
-#define MAX_BPF_STACK	512
+/* BPF program can access up to 768 bytes of stack space. */
+#define MAX_BPF_STACK	768
 
 /* Helper macros for filter block array initializers. */