mm, page_alloc: put should_fail_alloc_page() back behing CONFIG_FAIL_PAGE_ALLOC

This mostly reverts commit af3b854492f3 ("mm/page_alloc.c: allow error
injection").  The commit made should_fail_alloc_page() a noinline function
that's always called from the page allocation hotpath, even if it's empty
because CONFIG_FAIL_PAGE_ALLOC is not enabled, and there is no option to
disable it and prevent the associated function call overhead.

As with the preceding patch "mm, slab: put should_failslab back behind
CONFIG_SHOULD_FAILSLAB" and for the same reasons, put the
should_fail_alloc_page() back behind the config option.  When enabled, the
ALLOW_ERROR_INJECTION and BTF_ID records are preserved so it's not a
complete revert.

Link: https://lkml.kernel.org/r/20240711-b4-fault-injection-reverts-v1-2-9e2651945d68@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Rientjes <rientjes@google.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Song Liu <song@kernel.org>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/fault-inject.h b/include/linux/fault-inject.h
index be6d0bc111adf841d1678f8a7ef40b5f2fee5cd5..354413950d34b74dddc94648420fe0157ba59620 100644 (file)
--- a/include/linux/fault-inject.h
+++ b/include/linux/fault-inject.h
@@ -91,12 +91,10 @@ static inline void fault_config_init(struct fault_config *config,
 
 struct kmem_cache;
 
-bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order);
-
 #ifdef CONFIG_FAIL_PAGE_ALLOC
-bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order);
+bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order);
 #else
-static inline bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
+static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
 {
        return false;
 }

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index e455654f3b91cd2c3cdfddd0289fa8fe378fea60..a81e18409ec931f5b12214eb1fbe40db7b5800ac 100644 (file)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -21122,7 +21122,9 @@ BTF_SET_START(btf_non_sleepable_error_inject)
  * Assume non-sleepable from bpf safety point of view.
  */
 BTF_ID(func, __filemap_add_folio)
+#ifdef CONFIG_FAIL_PAGE_ALLOC
 BTF_ID(func, should_fail_alloc_page)
+#endif
 #ifdef CONFIG_FAILSLAB
 BTF_ID(func, should_failslab)
 #endif

diff --git a/mm/fail_page_alloc.c b/mm/fail_page_alloc.c
index b1b09cce9394318f7efc6d717cd3517bdcd226fd..532851ce513223446178cbeb011790ec5fa3bf7f 100644 (file)
--- a/mm/fail_page_alloc.c
+++ b/mm/fail_page_alloc.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/fault-inject.h>
+#include <linux/error-injection.h>
 #include <linux/mm.h>
 
 static struct {
@@ -21,7 +22,7 @@ static int __init setup_fail_page_alloc(char *str)
 }
 __setup("fail_page_alloc=", setup_fail_page_alloc);
 
-bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
+bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
 {
        int flags = 0;
 
@@ -41,6 +42,7 @@ bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
 
        return should_fail_ex(&fail_page_alloc.attr, 1 << order, flags);
 }
+ALLOW_ERROR_INJECTION(should_fail_alloc_page, TRUE);
 
 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c46aedfc9a12f3cf0cb2f6984d72047fadb6ca3e..3398d914ed838e6c957c165e0c58e3eeb8e86261 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3050,12 +3050,6 @@ out:
        return page;
 }
 
-noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
-{
-       return __should_fail_alloc_page(gfp_mask, order);
-}
-ALLOW_ERROR_INJECTION(should_fail_alloc_page, TRUE);
-
 static inline long __zone_watermark_unusable_free(struct zone *z,
                                unsigned int order, unsigned int alloc_flags)
 {