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From: Zi Yan <zi.yan@sent.com>
To: David Hildenbrand <david@redhat.com>, linux-mm@kvack.org
Cc: Matthew Wilcox <willy@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Michal Hocko <mhocko@kernel.org>,
	John Hubbard <jhubbard@nvidia.com>,
	linux-kernel@vger.kernel.org, Zi Yan <ziy@nvidia.com>,
	Andy Lutomirski <luto@kernel.org>,
	x86@kernel.org
Subject: [RFC PATCH 01/15] arch: x86: remove MAX_ORDER exceeding SECTION_SIZE check for 32bit vdso.
Date: Thu,  5 Aug 2021 15:02:39 -0400	[thread overview]
Message-ID: <20210805190253.2795604-2-zi.yan@sent.com> (raw)
In-Reply-To: <20210805190253.2795604-1-zi.yan@sent.com>

From: Zi Yan <ziy@nvidia.com>

For x86_64, 32bit vdso is compiled for compatibility reason and 32bit
SECTION_SIZE_BITS value is used during compilation. It causes
compilation time error when MAX_ORDER is increased in the 64bit
environment even if it is OK for 64bit SECTION_SIZE_BITS. Remove the
check during 32bit vdso compilation. The check still exists during the
compilation of other kernel components.

Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
---
 arch/x86/entry/vdso/Makefile | 1 +
 include/linux/mmzone.h       | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
index 05c4abc2fdfd..cad339136ed1 100644
--- a/arch/x86/entry/vdso/Makefile
+++ b/arch/x86/entry/vdso/Makefile
@@ -156,6 +156,7 @@ KBUILD_CFLAGS_32 += -fno-stack-protector
 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
+KBUILD_CFLAGS_32 += -DNO_MAX_ORDER_CHECK
 
 ifdef CONFIG_RETPOLINE
 ifneq ($(RETPOLINE_VDSO_CFLAGS),)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 6a1d79d84675..c1d914a72489 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1245,9 +1245,12 @@ static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
 #define SECTION_BLOCKFLAGS_BITS \
 	((1UL << (PFN_SECTION_SHIFT - pageblock_order)) * NR_PAGEBLOCK_BITS)
 
+/* NO_MAX_ORDER_CHECK when compiling x64 32bit VDSO for 64bit system */
+#ifndef NO_MAX_ORDER_CHECK
 #if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS
 #error Allocator MAX_ORDER exceeds SECTION_SIZE
 #endif
+#endif /* NO_MAX_ORDER_CHECK */
 
 static inline unsigned long pfn_to_section_nr(unsigned long pfn)
 {
-- 
2.30.2


  reply	other threads:[~2021-08-05 19:03 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-05 19:02 [RFC PATCH 00/15] Make MAX_ORDER adjustable as a kernel boot time parameter Zi Yan
2021-08-05 19:02 ` Zi Yan [this message]
2021-08-05 19:02 ` [RFC PATCH 02/15] arch: mm: rename FORCE_MAX_ZONEORDER to ARCH_FORCE_MAX_ORDER Zi Yan
2021-08-05 19:02 ` [RFC PATCH 03/15] mm: check pfn validity when buddy allocator can merge pages across mem sections Zi Yan
2021-08-05 19:02 ` [RFC PATCH 04/15] mm: prevent pageblock size being larger than section size Zi Yan
2021-08-05 19:02 ` [RFC PATCH 05/15] mm/memory_hotplug: online pages at " Zi Yan
2021-08-05 19:02 ` [RFC PATCH 06/15] mm: use PAGES_PER_SECTION instead for mem_map_offset/next() Zi Yan
2021-08-05 19:02 ` [RFC PATCH 07/15] mm: hugetlb: use PAGES_PER_SECTION to check mem_map discontiguity Zi Yan
2021-08-05 19:02 ` [RFC PATCH 08/15] fs: proc: use PAGES_PER_SECTION for page offline checking period Zi Yan
2021-08-07 10:32   ` Mike Rapoport
2021-08-09 15:45     ` [RFC PATCH 08/15] " Zi Yan
2021-08-05 19:02 ` [RFC PATCH 09/15] virtio: virtio_mem: use PAGES_PER_SECTION instead of MAX_ORDER_NR_PAGES Zi Yan
2021-08-09  7:35   ` David Hildenbrand
2021-08-05 19:02 ` [RFC PATCH 10/15] virtio: virtio_balloon: " Zi Yan
2021-08-09  7:42   ` David Hildenbrand
2021-08-05 19:02 ` [RFC PATCH 11/15] mm/page_reporting: report pages at section size instead of MAX_ORDER Zi Yan
2021-08-09  7:25   ` David Hildenbrand
2021-08-09 14:12     ` Alexander Duyck
2021-08-09 15:08       ` Zi Yan
2021-08-09 16:51         ` Alexander Duyck
2021-08-09 14:08   ` Alexander Duyck
2021-08-05 19:02 ` [RFC PATCH 12/15] mm: Make MAX_ORDER of buddy allocator configurable via Kconfig SET_MAX_ORDER Zi Yan
2021-08-06 15:16   ` Vlastimil Babka
2021-08-06 15:23     ` Zi Yan
2021-08-05 19:02 ` [RFC PATCH 13/15] mm: convert MAX_ORDER sized static arrays to dynamic ones Zi Yan
2021-08-05 19:16   ` Christian König
2021-08-05 19:58     ` Zi Yan
2021-08-06  9:37       ` Christian König
2021-08-06 14:00         ` Zi Yan
2021-08-05 19:02 ` [RFC PATCH 14/15] mm: introduce MIN_MAX_ORDER to replace MAX_ORDER as compile time constant Zi Yan
2021-08-08  8:23   ` Mike Rapoport
2021-08-09 15:35     ` Zi Yan
2021-08-05 19:02 ` [RFC PATCH 15/15] mm: make MAX_ORDER a kernel boot time parameter Zi Yan
2021-08-06 15:36 ` [RFC PATCH 00/15] Make MAX_ORDER adjustable as " Vlastimil Babka
2021-08-06 16:16   ` David Hildenbrand
2021-08-06 16:54     ` Vlastimil Babka
2021-08-06 17:08       ` David Hildenbrand
2021-08-06 18:24         ` Zi Yan
2021-08-09  7:20           ` David Hildenbrand
2021-08-08  7:41       ` Mike Rapoport
2021-08-06 16:32 ` Vlastimil Babka
2021-08-06 17:19   ` Zi Yan
2021-08-06 20:27     ` Hugh Dickins
2021-08-06 21:26       ` Zi Yan
2021-08-09  4:04         ` Hugh Dickins
2021-08-07  1:10       ` Matthew Wilcox
2021-08-07 21:23         ` Matthew Wilcox
2021-08-09  4:29         ` Hugh Dickins
2021-08-09 11:22           ` Matthew Wilcox
2021-08-09  7:41 ` David Hildenbrand

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