[v8,02/10] Remove __after_morecore_hook
Checks
Context |
Check |
Description |
dj/TryBot-apply_patch |
success
|
Patch applied to master at the time it was sent
|
Commit Message
Remove __after_morecore_hook from the API and finalize the symbol so
that it can no longer be used in new applications. Old applications
using __after_morecore_hook will find that their hook is no longer
called.
---
malloc/hooks.c | 5 +++++
malloc/malloc.c | 22 +---------------------
malloc/malloc.h | 3 ---
3 files changed, 6 insertions(+), 24 deletions(-)
Comments
On 7/13/21 3:38 AM, Siddhesh Poyarekar wrote:
> Remove __after_morecore_hook from the API and finalize the symbol so
> that it can no longer be used in new applications. Old applications
> using __after_morecore_hook will find that their hook is no longer
> called.
OK for 2.34.
Tested without regression on x86_64 and i686.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
> ---
> malloc/hooks.c | 5 +++++
> malloc/malloc.c | 22 +---------------------
> malloc/malloc.h | 3 ---
> 3 files changed, 6 insertions(+), 24 deletions(-)
>
> diff --git a/malloc/hooks.c b/malloc/hooks.c
> index daa5c7cfae..45c91d6502 100644
> --- a/malloc/hooks.c
> +++ b/malloc/hooks.c
> @@ -17,6 +17,11 @@
> License along with the GNU C Library; see the file COPYING.LIB. If
> not, see <https://www.gnu.org/licenses/>. */
>
> +#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
> +void weak_variable (*__after_morecore_hook) (void) = NULL;
> +compat_symbol (libc, __after_morecore_hook, __after_morecore_hook, GLIBC_2_0);
OK.
> +#endif
> +
> /* Hooks for debugging versions. The initial hooks just call the
> initialization routine, then do the normal work. */
>
> diff --git a/malloc/malloc.c b/malloc/malloc.c
> index 154f6b460c..24e7854a0e 100644
> --- a/malloc/malloc.c
> +++ b/malloc/malloc.c
> @@ -2041,8 +2041,6 @@ void *weak_variable (*__realloc_hook)
> void *weak_variable (*__memalign_hook)
> (size_t __alignment, size_t __size, const void *)
> = memalign_hook_ini;
> -void weak_variable (*__after_morecore_hook) (void) = NULL;
> -
OK.
> /* This function is called from the arena shutdown hook, to free the
> thread cache (if it exists). */
> static void tcache_thread_shutdown (void);
> @@ -2668,14 +2666,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
> LIBC_PROBE (memory_sbrk_more, 2, brk, size);
> }
>
> - if (brk != (char *) (MORECORE_FAILURE))
> - {
> - /* Call the `morecore' hook if necessary. */
> - void (*hook) (void) = atomic_forced_read (__after_morecore_hook);
> - if (__builtin_expect (hook != NULL, 0))
> - (*hook)();
> - }
> - else
OK.
> + if (brk == (char *) (MORECORE_FAILURE))
> {
> /*
> If have mmap, try using it as a backup when MORECORE fails or
> @@ -2814,13 +2805,6 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
> correction = 0;
> snd_brk = (char *) (MORECORE (0));
> }
> - else
> - {
> - /* Call the `morecore' hook if necessary. */
> - void (*hook) (void) = atomic_forced_read (__after_morecore_hook);
> - if (__builtin_expect (hook != NULL, 0))
> - (*hook)();
> - }
OK.
> }
>
> /* handle non-contiguous cases */
> @@ -2979,10 +2963,6 @@ systrim (size_t pad, mstate av)
> */
>
> MORECORE (-extra);
> - /* Call the `morecore' hook if necessary. */
> - void (*hook) (void) = atomic_forced_read (__after_morecore_hook);
> - if (__builtin_expect (hook != NULL, 0))
> - (*hook)();
OK.
> new_brk = (char *) (MORECORE (0));
>
> LIBC_PROBE (memory_sbrk_less, 2, new_brk, extra);
> diff --git a/malloc/malloc.h b/malloc/malloc.h
> index c1c0896d29..634b7db868 100644
> --- a/malloc/malloc.h
> +++ b/malloc/malloc.h
> @@ -179,9 +179,6 @@ extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook)(size_t __alignment,
> size_t __size,
> const void *)
> __MALLOC_DEPRECATED;
> -extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void)
> - __MALLOC_DEPRECATED;
OK.
> -
>
> __END_DECLS
> #endif /* malloc.h */
>
@@ -17,6 +17,11 @@
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
+void weak_variable (*__after_morecore_hook) (void) = NULL;
+compat_symbol (libc, __after_morecore_hook, __after_morecore_hook, GLIBC_2_0);
+#endif
+
/* Hooks for debugging versions. The initial hooks just call the
initialization routine, then do the normal work. */
@@ -2041,8 +2041,6 @@ void *weak_variable (*__realloc_hook)
void *weak_variable (*__memalign_hook)
(size_t __alignment, size_t __size, const void *)
= memalign_hook_ini;
-void weak_variable (*__after_morecore_hook) (void) = NULL;
-
/* This function is called from the arena shutdown hook, to free the
thread cache (if it exists). */
static void tcache_thread_shutdown (void);
@@ -2668,14 +2666,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
LIBC_PROBE (memory_sbrk_more, 2, brk, size);
}
- if (brk != (char *) (MORECORE_FAILURE))
- {
- /* Call the `morecore' hook if necessary. */
- void (*hook) (void) = atomic_forced_read (__after_morecore_hook);
- if (__builtin_expect (hook != NULL, 0))
- (*hook)();
- }
- else
+ if (brk == (char *) (MORECORE_FAILURE))
{
/*
If have mmap, try using it as a backup when MORECORE fails or
@@ -2814,13 +2805,6 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
correction = 0;
snd_brk = (char *) (MORECORE (0));
}
- else
- {
- /* Call the `morecore' hook if necessary. */
- void (*hook) (void) = atomic_forced_read (__after_morecore_hook);
- if (__builtin_expect (hook != NULL, 0))
- (*hook)();
- }
}
/* handle non-contiguous cases */
@@ -2979,10 +2963,6 @@ systrim (size_t pad, mstate av)
*/
MORECORE (-extra);
- /* Call the `morecore' hook if necessary. */
- void (*hook) (void) = atomic_forced_read (__after_morecore_hook);
- if (__builtin_expect (hook != NULL, 0))
- (*hook)();
new_brk = (char *) (MORECORE (0));
LIBC_PROBE (memory_sbrk_less, 2, new_brk, extra);
@@ -179,9 +179,6 @@ extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook)(size_t __alignment,
size_t __size,
const void *)
__MALLOC_DEPRECATED;
-extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void)
- __MALLOC_DEPRECATED;
-
__END_DECLS
#endif /* malloc.h */