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Message-Id: <20240905142220.49d93337a0abce5690e515d9@linux-foundation.org> Date: Thu, 5 Sep 2024 14:22:20 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com> Subject: Re: [PATCH v1 1/1] mm/page_alloc: Mark has_unaccepted_memory() with __maybe_unused On Thu, 5 Sep 2024 20:15:53 +0300 Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote: > When has_unaccepted_memory() is unused, it prevents kernel builds > with clang, `make W=1` and CONFIG_WERROR=y: > > mm/page_alloc.c:7036:20: error: unused function 'has_unaccepted_memory' [-Werror,-Wunused-function] > 7036 | static inline bool has_unaccepted_memory(void) > | ^~~~~~~~~~~~~~~~~~~~~ > > Fix this by marking it with __maybe_unused (all cases for the sake of > symmetry). > > See also commit 6863f5643dd7 ("kbuild: allow Clang to find unused static > inline functions for W=1 build"). > has_unaccepted_memory() has no callers if CONFIG_UNACCEPTED_MEMORY=n. Can't we do this better thing? --- a/mm/page_alloc.c~a +++ a/mm/page_alloc.c @@ -288,7 +288,6 @@ EXPORT_SYMBOL(nr_online_nodes); static bool page_contains_unaccepted(struct page *page, unsigned int order); static void accept_page(struct page *page, unsigned int order); static bool cond_accept_memory(struct zone *zone, unsigned int order); -static inline bool has_unaccepted_memory(void); static bool __free_unaccepted(struct page *page); int page_group_by_mobility_disabled __read_mostly; @@ -6963,6 +6962,11 @@ static bool try_to_accept_memory_one(str return true; } +static inline bool has_unaccepted_memory(void) +{ + return static_branch_unlikely(&zones_with_unaccepted_pages); +} + static bool cond_accept_memory(struct zone *zone, unsigned int order) { long to_accept; @@ -6990,11 +6994,6 @@ static bool cond_accept_memory(struct zo return ret; } -static inline bool has_unaccepted_memory(void) -{ - return static_branch_unlikely(&zones_with_unaccepted_pages); -} - static bool __free_unaccepted(struct page *page) { struct zone *zone = page_zone(page); @@ -7032,11 +7031,6 @@ static bool cond_accept_memory(struct zo { return false; } - -static inline bool has_unaccepted_memory(void) -{ - return false; -} static bool __free_unaccepted(struct page *page) { _
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