@@ -8,10 +8,10 @@
struct rtas_args;
-asmlinkage unsigned long sys_mmap(unsigned long addr, size_t len,
+asmlinkage long sys_mmap(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t offset);
-asmlinkage unsigned long sys_mmap2(unsigned long addr, size_t len,
+asmlinkage long sys_mmap2(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff);
asmlinkage long ppc64_personality(unsigned long personality);
@@ -42,11 +42,11 @@
#include <asm/unistd.h>
#include <asm/asm-prototypes.h>
-static inline unsigned long do_mmap2(unsigned long addr, size_t len,
+static inline long do_mmap2(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long off, int shift)
{
- unsigned long ret = -EINVAL;
+ long ret = -EINVAL;
if (!arch_validate_prot(prot))
goto out;
@@ -62,16 +62,16 @@ static inline unsigned long do_mmap2(unsigned long addr, size_t len,
return ret;
}
-unsigned long sys_mmap2(unsigned long addr, size_t len,
- unsigned long prot, unsigned long flags,
- unsigned long fd, unsigned long pgoff)
+SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
+ unsigned long, prot, unsigned long, flags,
+ unsigned long, fd, unsigned long, pgoff)
{
return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
}
-unsigned long sys_mmap(unsigned long addr, size_t len,
- unsigned long prot, unsigned long flags,
- unsigned long fd, off_t offset)
+SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
+ unsigned long, prot, unsigned long, flags,
+ unsigned long, fd, off_t, offset)
{
return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
}
This patch uses SYSCALL_DEFINE6 for sys_mmap and sys_mmap2 so that the meta-data associated with these syscalls is visible to the syscall tracer. In the absence of this generic syscalls (defined outside arch) like munmap,etc. are visible in available_events, syscall_enter_mmap and syscall_exit_mmap is not. A side-effect of this change is that the return type has changed from unsigned long to long. Prior to these changes, we had, under /sys/kernel/tracing cat available_events | grep syscalls | grep map syscalls:sys_exit_remap_file_pages syscalls:sys_enter_remap_file_pages syscalls:sys_exit_munmap syscalls:sys_enter_munmap syscalls:sys_exit_mremap syscalls:sys_enter_mremap After these changes we have mmap in available_events. cat available_events | grep syscalls | grep map syscalls:sys_exit_mmap syscalls:sys_enter_mmap syscalls:sys_exit_remap_file_pages syscalls:sys_enter_remap_file_pages syscalls:sys_exit_munmap syscalls:sys_enter_munmap syscalls:sys_exit_mremap syscalls:sys_enter_mremap Sample trace: cat-3399 [001] .... 196.542410: sys_mmap(addr: 7fff922a0000, len: 20000, prot: 3, flags: 812, fd: 3, offset: 1b0000) cat-3399 [001] .... 196.542443: sys_mmap -> 0x7fff922a0000 cat-3399 [001] .... 196.542668: sys_munmap(addr: 7fff922c0000, len: 6d2c) cat-3399 [001] .... 196.542677: sys_munmap -> 0x0 Signed-off-by: Balbir Singh <bsingharora@gmail.com> --- Changelog: Removed RFC Fixed len from unsigned long to size_t Added some examples of use of mmap trace arch/powerpc/include/asm/syscalls.h | 4 ++-- arch/powerpc/kernel/syscalls.c | 16 ++++++++-------- 2 files changed, 10 insertions(+), 10 deletions(-)