path: root/samples/kfifo/record-example.c
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authorPeter Zijlstra <peterz@infradead.org>2020-02-03 17:37:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-02-04 03:05:26 +0000
commit0d6e24d430ef23280d8dea0ba1faeefc66c26a57 (patch)
tree6fb47b4bee252781c30105392a143e9a9a688903 /samples/kfifo/record-example.c
parentasm-generic/tlb: rename HAVE_MMU_GATHER_NO_GATHER (diff)
asm-generic/tlb: provide MMU_GATHER_TABLE_FREE
As described in the comment, the correct order for freeing pages is: 1) unhook page 2) TLB invalidate page 3) free page This order equally applies to page directories. Currently there are two correct options: - use tlb_remove_page(), when all page directores are full pages and there are no futher contraints placed by things like software walkers (HAVE_FAST_GUP). - use MMU_GATHER_RCU_TABLE_FREE and tlb_remove_table() when the architecture does not do IPI based TLB invalidate and has HAVE_FAST_GUP (or software TLB fill). This however leaves architectures that don't have page based directories but don't need RCU in a bind. For those, provide MMU_GATHER_TABLE_FREE, which provides the independent batching for directories without the additional RCU freeing. Link: http://lkml.kernel.org/r/20200116064531.483522-10-aneesh.kumar@linux.ibm.com Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'samples/kfifo/record-example.c')
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