[PATCH 5/5] tile: query dynamic DEBUG_PAGEALLOC setting
From: Joonsoo Kim <hidden>
Date: 2016-02-04 05:58:24
Also in:
linux-mm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
We can disable debug_pagealloc processing even if the code is complied with CONFIG_DEBUG_PAGEALLOC. This patch changes the code to query whether it is enabled or not in runtime. Signed-off-by: Joonsoo Kim <redacted> --- arch/tile/mm/init.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c
index d4e1fc4..a0582b7 100644
--- a/arch/tile/mm/init.c
+++ b/arch/tile/mm/init.c@@ -896,17 +896,15 @@ void __init pgtable_cache_init(void) panic("pgtable_cache_init(): Cannot create pgd cache"); } -#ifdef CONFIG_DEBUG_PAGEALLOC -static long __write_once initfree; -#else static long __write_once initfree = 1; -#endif +static bool __write_once set_initfree_done; /* Select whether to free (1) or mark unusable (0) the __init pages. */ static int __init set_initfree(char *str) { long val; if (kstrtol(str, 0, &val) == 0) { + set_initfree_done = true; initfree = val; pr_info("initfree: %s free init pages\n", initfree ? "will" : "won't");
@@ -919,6 +917,11 @@ static void free_init_pages(char *what, unsigned long begin, unsigned long end) { unsigned long addr = (unsigned long) begin; + /* Prefer user request first */ + if (!set_initfree_done) { + if (debug_pagealloc_enabled()) + initfree = 0; + } if (kdata_huge && !initfree) { pr_warn("Warning: ignoring initfree=0: incompatible with kdata=huge\n"); initfree = 1;
--
1.9.1
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