diff options
| author | Ingo Molnar | 2008-01-30 13:33:58 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2008-01-30 13:33:58 +0100 |
| commit | 12d6f21eacc21d84a809829543f2fe45c7e37319 (patch) | |
| tree | 6985f2370ad238fb2a568547a5049751d7c95a69 /arch | |
| parent | x86: cpa: simplify locking (diff) | |
| download | kernel-qcow2-linux-12d6f21eacc21d84a809829543f2fe45c7e37319.tar.gz kernel-qcow2-linux-12d6f21eacc21d84a809829543f2fe45c7e37319.tar.xz kernel-qcow2-linux-12d6f21eacc21d84a809829543f2fe45c7e37319.zip | |
x86: do not PSE on CONFIG_DEBUG_PAGEALLOC=y
get more testing of the c_p_a() code done by not turning off
PSE on DEBUG_PAGEALLOC.
this simplifies the early pagetable setup code, and tests
the largepage-splitup code quite heavily.
In the end, all the largepages will be split up pretty quickly,
so there's no difference to how DEBUG_PAGEALLOC worked before.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 7 | ||||
| -rw-r--r-- | arch/x86/mm/pageattr_32.c | 12 |
2 files changed, 11 insertions, 8 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index bba850b05d0e..db28aa9e2f69 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -641,13 +641,6 @@ void __init early_cpu_init(void) nexgen_init_cpu(); umc_init_cpu(); early_cpu_detect(); - -#ifdef CONFIG_DEBUG_PAGEALLOC - /* pse is not compatible with on-the-fly unmapping, - * disable it even if the cpus claim to support it. - */ - setup_clear_cpu_cap(X86_FEATURE_PSE); -#endif } /* Make sure %fs is initialized properly in idle threads */ diff --git a/arch/x86/mm/pageattr_32.c b/arch/x86/mm/pageattr_32.c index 9cf2fea54eb5..dd49b16b3a0e 100644 --- a/arch/x86/mm/pageattr_32.c +++ b/arch/x86/mm/pageattr_32.c @@ -61,13 +61,17 @@ static void __set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte) static int split_large_page(pte_t *kpte, unsigned long address) { pgprot_t ref_prot = pte_pgprot(pte_clrhuge(*kpte)); + gfp_t gfp_flags = GFP_KERNEL; unsigned long flags; unsigned long addr; pte_t *pbase, *tmp; struct page *base; int i, level; - base = alloc_pages(GFP_KERNEL, 0); +#ifdef CONFIG_DEBUG_PAGEALLOC + gfp_flags = GFP_ATOMIC; +#endif + base = alloc_pages(gfp_flags, 0); if (!base) return -ENOMEM; @@ -219,6 +223,12 @@ void kernel_map_pages(struct page *page, int numpages, int enable) } /* + * If page allocator is not up yet then do not call c_p_a(): + */ + if (!debug_pagealloc_enabled) + return; + + /* * the return value is ignored - the calls cannot fail, * large pages are disabled at boot time. */ |