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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2017-03-17 00:39:06 +0300
committerIngo Molnar <mingo@kernel.org>2017-03-18 09:48:03 +0100
commit2947ba054a4dabbd82848728d765346886050029 (patch)
tree33f5aa9089e59c49fc531813d59c50074f729098 /mm
parent73e10a61817dfc97fe7418bfad1f608e562d7348 (diff)
x86/mm/gup: Switch GUP to the generic get_user_page_fast() implementation
This patch provides all required callbacks required by the generic get_user_pages_fast() code and switches x86 over - and removes the platform specific implementation. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Aneesh Kumar K . V <aneesh.kumar@linux.vnet.ibm.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dann Frazier <dann.frazier@canonical.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Steve Capper <steve.capper@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arch@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20170316213906.89528-1-kirill.shutemov@linux.intel.com [ Minor readability edits. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/Kconfig2
-rw-r--r--mm/gup.c10
2 files changed, 6 insertions, 6 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 9b8fccb969dc..c89f472b658c 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -137,7 +137,7 @@ config HAVE_MEMBLOCK_NODE_MAP
config HAVE_MEMBLOCK_PHYS_MAP
bool
-config HAVE_GENERIC_RCU_GUP
+config HAVE_GENERIC_GUP
bool
config ARCH_DISCARD_MEMBLOCK
diff --git a/mm/gup.c b/mm/gup.c
index 527ec2c6cca3..2559a3987de7 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1155,7 +1155,7 @@ struct page *get_dump_page(unsigned long addr)
#endif /* CONFIG_ELF_CORE */
/*
- * Generic RCU Fast GUP
+ * Generic Fast GUP
*
* get_user_pages_fast attempts to pin user pages by walking the page
* tables directly and avoids taking locks. Thus the walker needs to be
@@ -1176,8 +1176,8 @@ struct page *get_dump_page(unsigned long addr)
* Before activating this code, please be aware that the following assumptions
* are currently made:
*
- * *) HAVE_RCU_TABLE_FREE is enabled, and tlb_remove_table is used to free
- * pages containing page tables.
+ * *) Either HAVE_RCU_TABLE_FREE is enabled, and tlb_remove_table() is used to
+ * free pages containing page tables or TLB flushing requires IPI broadcast.
*
* *) ptes can be read atomically by the architecture.
*
@@ -1187,7 +1187,7 @@ struct page *get_dump_page(unsigned long addr)
*
* This code is based heavily on the PowerPC implementation by Nick Piggin.
*/
-#ifdef CONFIG_HAVE_GENERIC_RCU_GUP
+#ifdef CONFIG_HAVE_GENERIC_GUP
#ifndef gup_get_pte
/*
@@ -1677,4 +1677,4 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
return ret;
}
-#endif /* CONFIG_HAVE_GENERIC_RCU_GUP */
+#endif /* CONFIG_HAVE_GENERIC_GUP */