| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 16 Nov 2012 19:39:12 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Stefano Stabellini <stefano.stabellini@...citrix.com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH v8 35/46] x86, mm: use round_up/down in split_mem_range()
to replace own inline version for those roundup and rounddown.
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
arch/x86/mm/init.c | 30 ++++++++++++------------------
1 files changed, 12 insertions(+), 18 deletions(-)
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 8168bf8..0e625e6 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -218,13 +218,11 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
* slowdowns.
*/
if (pos == 0)
- end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT);
+ end_pfn = PMD_SIZE >> PAGE_SHIFT;
else
- end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
+ end_pfn = round_up(pos, PMD_SIZE) >> PAGE_SHIFT;
#else /* CONFIG_X86_64 */
- end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
+ end_pfn = round_up(pos, PMD_SIZE) >> PAGE_SHIFT;
#endif
if (end_pfn > (end >> PAGE_SHIFT))
end_pfn = end >> PAGE_SHIFT;
@@ -234,15 +232,13 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
}
/* big page (2M) range */
- start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
+ start_pfn = round_up(pos, PMD_SIZE) >> PAGE_SHIFT;
#ifdef CONFIG_X86_32
- end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
+ end_pfn = round_down(end, PMD_SIZE) >> PAGE_SHIFT;
#else /* CONFIG_X86_64 */
- end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
- << (PUD_SHIFT - PAGE_SHIFT);
- if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
- end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
+ end_pfn = round_up(pos, PUD_SIZE) >> PAGE_SHIFT;
+ if (end_pfn > (round_down(end, PMD_SIZE) >> PAGE_SHIFT))
+ end_pfn = round_down(end, PMD_SIZE) >> PAGE_SHIFT;
#endif
if (start_pfn < end_pfn) {
@@ -253,9 +249,8 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
#ifdef CONFIG_X86_64
/* big page (1G) range */
- start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
- << (PUD_SHIFT - PAGE_SHIFT);
- end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
+ start_pfn = round_up(pos, PUD_SIZE) >> PAGE_SHIFT;
+ end_pfn = round_down(end, PUD_SIZE) >> PAGE_SHIFT;
if (start_pfn < end_pfn) {
nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
page_size_mask &
@@ -264,9 +259,8 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
}
/* tail is not big page (1G) alignment */
- start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
- end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
+ start_pfn = round_up(pos, PMD_SIZE) >> PAGE_SHIFT;
+ end_pfn = round_down(end, PMD_SIZE) >> PAGE_SHIFT;
if (start_pfn < end_pfn) {
nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
page_size_mask & (1<<PG_LEVEL_2M));
--
1.7.7
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists