From 8ff812719ac73ef9428b788e210221c8d87b2a8c Mon Sep 17 00:00:00 2001 From: Hari Bathini Date: Fri, 15 Nov 2013 23:01:32 +0530 Subject: powerpc/kdump: Adding symbols in vmcoreinfo to facilitate dump filtering When CONFIG_SPARSEMEM_VMEMMAP option is used in kernel, makedumpfile fails to filter vmcore dump as it fails to do vmemmap translations. So far dump filtering on ppc64 never had to deal with vmemmap addresses seperately as vmemmap regions where mapped in zone normal. But with the inclusion of CONFIG_SPARSEMEM_VMEMMAP config option in kernel, this vmemmap address translation support becomes necessary for dump filtering. For vmemmap adress translation, few kernel symbols are needed by dump filtering tool. This patch adds those symbols to vmcoreinfo, which a dump filtering tool can use for filtering the kernel dump. Tested this changes successfully with makedumpfile tool that supports vmemmap to physical address translation outside zone normal. [ Removed unneeded #ifdef as suggested by Michael Ellerman --BenH ] Signed-off-by: Hari Bathini Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/pgalloc-64.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/powerpc/include/asm/pgalloc-64.h') diff --git a/arch/powerpc/include/asm/pgalloc-64.h b/arch/powerpc/include/asm/pgalloc-64.h index 16cb92d215d..694012877bf 100644 --- a/arch/powerpc/include/asm/pgalloc-64.h +++ b/arch/powerpc/include/asm/pgalloc-64.h @@ -16,6 +16,7 @@ struct vmemmap_backing { unsigned long phys; unsigned long virt_addr; }; +extern struct vmemmap_backing *vmemmap_list; /* * Functions that deal with pagetables that could be at any level of -- cgit v1.2.3-70-g09d2 From cf77ee54362a245f9a01f240adce03a06c05eb68 Mon Sep 17 00:00:00 2001 From: "Hong H. Pham" Date: Sat, 7 Dec 2013 09:06:33 -0500 Subject: powerpc: Fix PTE page address mismatch in pgtable ctor/dtor In pte_alloc_one(), pgtable_page_ctor() is passed an address that has not been converted by page_address() to the newly allocated PTE page. When the PTE is freed, __pte_free_tlb() calls pgtable_page_dtor() with an address to the PTE page that has been converted by page_address(). The mismatch in the PTE's page address causes pgtable_page_dtor() to access invalid memory, so resources for that PTE (such as the page lock) is not properly cleaned up. On PPC32, only SMP kernels are affected. On PPC64, only SMP kernels with 4K page size are affected. This bug was introduced by commit d614bb041209fd7cb5e4b35e11a7b2f6ee8f62b8 "powerpc: Move the pte free routines from common header". On a preempt-rt kernel, a spinlock is dynamically allocated for each PTE in pgtable_page_ctor(). When the PTE is freed, calling pgtable_page_dtor() with a mismatched page address causes a memory leak, as the pointer to the PTE's spinlock is bogus. On mainline, there isn't any immediately obvious symptoms, but the problem still exists here. Fixes: d614bb041209fd7c "powerpc: Move the pte free routes from common header" Cc: Paul Mackerras Cc: Aneesh Kumar K.V Cc: Benjamin Herrenschmidt Cc: linux-stable # v3.10+ Signed-off-by: Hong H. Pham Reviewed-by: Aneesh Kumar K.V Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/pgalloc-32.h | 6 ++---- arch/powerpc/include/asm/pgalloc-64.h | 6 ++---- 2 files changed, 4 insertions(+), 8 deletions(-) (limited to 'arch/powerpc/include/asm/pgalloc-64.h') diff --git a/arch/powerpc/include/asm/pgalloc-32.h b/arch/powerpc/include/asm/pgalloc-32.h index 27b2386f738..842846c1b71 100644 --- a/arch/powerpc/include/asm/pgalloc-32.h +++ b/arch/powerpc/include/asm/pgalloc-32.h @@ -84,10 +84,8 @@ static inline void pgtable_free_tlb(struct mmu_gather *tlb, static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, unsigned long address) { - struct page *page = page_address(table); - tlb_flush_pgtable(tlb, address); - pgtable_page_dtor(page); - pgtable_free_tlb(tlb, page, 0); + pgtable_page_dtor(table); + pgtable_free_tlb(tlb, page_address(table), 0); } #endif /* _ASM_POWERPC_PGALLOC_32_H */ diff --git a/arch/powerpc/include/asm/pgalloc-64.h b/arch/powerpc/include/asm/pgalloc-64.h index 694012877bf..4b0be20fcbf 100644 --- a/arch/powerpc/include/asm/pgalloc-64.h +++ b/arch/powerpc/include/asm/pgalloc-64.h @@ -148,11 +148,9 @@ static inline void pgtable_free_tlb(struct mmu_gather *tlb, static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, unsigned long address) { - struct page *page = page_address(table); - tlb_flush_pgtable(tlb, address); - pgtable_page_dtor(page); - pgtable_free_tlb(tlb, page, 0); + pgtable_page_dtor(table); + pgtable_free_tlb(tlb, page_address(table), 0); } #else /* if CONFIG_PPC_64K_PAGES */ -- cgit v1.2.3-70-g09d2