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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Peter Xu , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Andrew Morton , David Hildenbrand , Shuah Khan , Jason Gunthorpe , Leon Romanovsky , Sarthak Sharma , Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1684; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=z6zKDPWdrXtG9iLWi9rtRD0L5GkOLNqFKE7DfB+aIRQ=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqsQi9VlnrICVKSmEAUcfLz+X3SNTnPnmmVJx4T PUKUnuuRKmJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCarEIvQAKCRBt1cPRWsUx My8ZC/9Q9H8MVJ1jK7QQreGRH10Hzcsa3P2Hyz86kIi5/jIeguUvGUmUfWV7D+4Dq20FpNDL2z4 ub+riKgocduYQDaixCZAwW06zIzSDCdAOoBp2H+2el3O+IAOA047HBlae/74X9sSKf8zUFNqrIo kBXhwpONsZWj9vdxpsh40ASMPdytSthFe9AAbYOmNc0Mh04BNg6jtifRdVQbSeHwz/+o3oBXiR0 o0sKMi6IvpMZAU3zyUJF0Sq7ZqogFjEv8gHl554UPQG7YB8ZwhEojuHw8Oqz0Kc/NEJBiSVBwc4 T3n7VbgQmCBXaXuoCampv/myhHndZvfcRQj0DzldVPtXtTdcKUhU8F6XwXdWrCQR3OTv7USxsk7 KW9HvBmr73grKKE8CGQklYYQyuwvCbd6Mu54ezU6S71z+OJCDxXUVteRnVSXHTtkynKuqOuAxyV DowvbkpDAHxqDZmRXcMxQTM4YzxQUeqyGDy93DKvTRXV7hnInJGpBCGWpvXwxHJq1sLJk= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 X-Stat-Signature: gppeof7jhth6udk76h9tmt51dti4yq3f X-Rspam-User: X-Rspamd-Queue-Id: 6D5B0C0003 X-Rspamd-Server: rspam03 X-HE-Tag: 1789987022-930390 X-HE-Meta: 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 31QpPlYr 2dWeW3pHa48S/qZOiHNiR7b8Ub0J8xoT+r0xakFtrXxImMI+a7qjXSupOlu2x4EoSaT8BEdLFpxOTTz8z99aoC/FqnzTQ17MMD7iuMHrGd+o6BexWk5JZSdGe2d9vt+balqaoofeoTPEW+LNnxqtl8ZgCj7hoMANog6no7B4kQ+yNrlmEeCyfC0k3mzGNSspohWhWghHcosOEqq0HrQikM8lkRlBFK5reOzXtjVGE4bN2R0B+Er10oql8NJ3ijN3kroEl/t+DKZKZi4j17USDpsozmqcmGAQXDPvYgmfKybhJAPaN+ttUw9EhdMZ90W8xPiKDx7FLQqP6r7M= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Introduce size_to_shift() for future users that need to obtain shift of a huge-page which is other than pmd_psize(). Suggested-by: David Hildenbrand (Arm) Reviewed-by: Lorenzo Stoakes (ARM) Signed-off-by: Yeoreum Yun --- tools/testing/selftests/mm/vm_util.c | 2 +- tools/testing/selftests/mm/vm_util.h | 12 ++++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index 8f80e73dc22a5..970671058397d 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -194,7 +194,7 @@ uint64_t pmd_pshift(void) if (__pmd_psize != -1ull) __pmd_psize = pmd_psize(); - __pmd_pshift = (__pmd_psize > 0) ? ffsl(__pmd_psize) - 1 : 0; + __pmd_pshift = size_to_shift(__pmd_psize); return __pmd_pshift; } diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h index 71af4804f8f24..6e37c90f3c3a5 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -148,6 +148,18 @@ static inline int sz2ord(size_t size, size_t pagesize) return __builtin_ctzll(size / pagesize); } +static inline uint64_t size_to_shift(uint64_t size) +{ + /* + * The function returns the corresponding shift only when the size + * is a power of two; otherwise, it returns 0. + */ + if (!size || (size & (size - 1))) + return 0; + + return ffsl(size) - 1; +} + void *sys_mremap(void *old_address, unsigned long old_size, unsigned long new_size, int flags, void *new_address); -- 2.43.0