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| author | Tejun Heo <tj@kernel.org> | 2026-08-12 09:47:43 -1000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-08-24 18:43:24 -0700 |
| commit | f525001b3309a0decdcdcdaeceafd7ab9dc927fe (patch) | |
| tree | 1ac4d48fcc9dfe8729ea3a971ea45cfe2be19af9 /lib | |
| parent | f7e698e326b239a91ea15844817551921209e826 (diff) | |
| download | linux-f525001b3309a0decdcdcdaeceafd7ab9dc927fe.tar.gz linux-f525001b3309a0decdcdcdaeceafd7ab9dc927fe.zip | |
percpu: drop CONFIG_DEBUG_FORCE_WEAK_PER_CPU
alpha requires percpu variables in modules to be defined as weak so that the
compiler generates GOT based external references for them. This puts two
extra restrictions on percpu variable definitions. The symbol must be
globally unique even when static and a static percpu variable can't be
defined inside a function. DEBUG_FORCE_WEAK_PER_CPU exists to give generic
code build coverage for these restrictions without building for alpha.
MEM_ALLOC_PROFILING defines a static percpu counter at each allocation call
site and thus can't be built with weak percpu definitions, so it depends on
!DEBUG_FORCE_WEAK_PER_CPU. As allmodconfig enables DEBUG_FORCE_WEAK_PER_CPU,
this knocks MEM_ALLOC_PROFILING out of allmodconfig build coverage.
allmodconfig coverage for MEM_ALLOC_PROFILING is worth more than build
coverage for restrictions which only matter to alpha module builds. Drop
DEBUG_FORCE_WEAK_PER_CPU. Restriction violations will now show up only on
alpha builds.
Link: https://lore.kernel.org/178656406317.2437052.7257990869957704195@slm.duckdns.org
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Acked-by: Gabriele Monaco <gmonaco@redhat.com> [include/rv/da_monitor.h]
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index b82515cde538..00921b1676e8 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -613,21 +613,6 @@ config BUILTIN_MODULE_RANGES It also records an anchor symbol to determine the load address of the section. -config DEBUG_FORCE_WEAK_PER_CPU - bool "Force weak per-cpu definitions" - depends on DEBUG_KERNEL - help - s390 and alpha require percpu variables in modules to be - defined weak to work around addressing range issue which - puts the following two restrictions on percpu variable - definitions. - - 1. percpu symbols must be unique whether static or not - 2. percpu variables can't be defined inside a function - - To ensure that generic code follows the above rules, this - option forces all percpu variables to be defined as weak. - config WARN_CONTEXT_ANALYSIS bool "Compiler context-analysis warnings" depends on CC_IS_CLANG && CLANG_VERSION >= 230000 |