[Devel] [PATCH RHEL7 COMMIT] x86/asm: remove the unused get_limit() method

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-1062.1.2.vz7.114.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1062.1.2.vz7.114.9
------>
commit 8632b85239ddea1825f618bdc8a4fb8135684280
Author: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
Date:   Fri Oct 25 13:17:18 2019 +0300

    x86/asm: remove the unused get_limit() method
    
    https://jira.sw.ru/browse/PSBM-96243
    
    (inspired by commit 72d64cc76941cde45e65e2a5b9fb81d527963645)
    To fix compilation of ("blk-wbt: add general throttling mechanism")
    Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
    
    =====================
    Patchset description:
    
    block: backport writeback throttling
    
    We have a problem that if we run heavy write load on one cpu
    simultaneousely with short direct reads on other cpu, the latter will
    hang significantly. Writeback throttling looks like a sollution for
    these reads, as it will decrease the priority of long running writeback.
    
    Running simple dd experiment we see that reads latency decreased after
    wbt patches applied:
    https://docs.google.com/spreadsheets/d/1HLtepwFL_N5zm0JcTqMtJoYnf-b6Slwld8DDgL0gNDI
    
    We've ran vconsolidate on custom kernel with these patches, though it
    does not show any performance improvement (likely because this test does
    not produce high rate of writeback), it does not crash or fail the test.
    
    https://jira.sw.ru/browse/PSBM-96243
    
    Jens Axboe (6):
      block: add REQ_BACKGROUND
      writeback: add wbc_to_write_flags()
      writeback: mark background writeback as such
      writeback: track if we're sleeping on progress in
        balance_dirty_pages()
      blk-wbt: add general throttling mechanism
      block: hook up writeback throttling
    
    Omar Sandoval (1):
      block: get rid of struct blk_issue_stat
    
    Pavel Tikhomirov (2):
      x86/asm: remove the unused get_limit() method
      block: enable CONFIG_BLK_WBT*
      blk-wbt: increase maximum queue depth to increase performance of writes
---
 arch/x86/include/asm/segment.h | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/arch/x86/include/asm/segment.h b/arch/x86/include/asm/segment.h
index 1919a722f011..99413282b67d 100644
--- a/arch/x86/include/asm/segment.h
+++ b/arch/x86/include/asm/segment.h
@@ -274,13 +274,6 @@ do {									\
 #endif	/* X86_32_LAZY_GS */
 #endif	/* X86_32 */
 
-static inline unsigned long get_limit(unsigned long segment)
-{
-	unsigned long __limit;
-	asm("lsll %1,%0" : "=r" (__limit) : "r" (segment));
-	return __limit + 1;
-}
-
 #endif /* !__ASSEMBLY__ */
 #endif /* __KERNEL__ */