From 018d2ad0cccfa9bb8bee1d160c353e568484a137 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Wed, 20 Jun 2007 12:23:36 +0200 Subject: [PATCH] x86: change_page_attr bandaids - Disable CLFLUSH again; it is still broken. Always do WBINVD. - Always flush in the i386 case, not only when there are deferred pages. These are both brute-force inefficient fixes, to be improved next release cycle. The changes to i386 are a little more extensive than strictly needed (some dead code added), but it is more similar to the x86-64 version now and the dead code will be used soon. Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- arch/i386/mm/pageattr.c | 30 ++++++++++++++++++------------ arch/x86_64/mm/pageattr.c | 7 ++++--- 2 files changed, 22 insertions(+), 15 deletions(-) diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c index 47bd477c8ec..2eb14a73be9 100644 --- a/arch/i386/mm/pageattr.c +++ b/arch/i386/mm/pageattr.c @@ -68,14 +68,23 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot, return base; } -static void flush_kernel_map(void *arg) +static void cache_flush_page(struct page *p) { - unsigned long adr = (unsigned long)arg; + unsigned long adr = (unsigned long)page_address(p); + int i; + for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size) + asm volatile("clflush (%0)" :: "r" (adr + i)); +} + +static void flush_kernel_map(void *arg) +{ + struct list_head *lh = (struct list_head *)arg; + struct page *p; - if (adr && cpu_has_clflush) { - int i; - for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size) - asm volatile("clflush (%0)" :: "r" (adr + i)); + /* High level code is not ready for clflush yet */ + if (0 && cpu_has_clflush) { + list_for_each_entry (p, lh, lru) + cache_flush_page(p); } else if (boot_cpu_data.x86_model >= 4) wbinvd(); @@ -181,9 +190,9 @@ __change_page_attr(struct page *page, pgprot_t prot) return 0; } -static inline void flush_map(void *adr) +static inline void flush_map(struct list_head *l) { - on_each_cpu(flush_kernel_map, adr, 1, 1); + on_each_cpu(flush_kernel_map, l, 1, 1); } /* @@ -225,11 +234,8 @@ void global_flush_tlb(void) spin_lock_irq(&cpa_lock); list_replace_init(&df_list, &l); spin_unlock_irq(&cpa_lock); - if (!cpu_has_clflush) - flush_map(NULL); + flush_map(&l); list_for_each_entry_safe(pg, next, &l, lru) { - if (cpu_has_clflush) - flush_map(page_address(pg)); __free_page(pg); } } diff --git a/arch/x86_64/mm/pageattr.c b/arch/x86_64/mm/pageattr.c index d653d0bf3df..9148f4a4cec 100644 --- a/arch/x86_64/mm/pageattr.c +++ b/arch/x86_64/mm/pageattr.c @@ -74,10 +74,11 @@ static void flush_kernel_map(void *arg) struct page *pg; /* When clflush is available always use it because it is - much cheaper than WBINVD */ - if (!cpu_has_clflush) + much cheaper than WBINVD. Disable clflush for now because + the high level code is not ready yet */ + if (1 || !cpu_has_clflush) asm volatile("wbinvd" ::: "memory"); - list_for_each_entry(pg, l, lru) { + else list_for_each_entry(pg, l, lru) { void *adr = page_address(pg); if (cpu_has_clflush) cache_flush_page(adr); -- 2.46.0