From: Mike Kravetz <mike.kravetz(a)oracle.com>
commit 16f8eb3eea9eb2a1568279d64ca4dc977e7aa538 upstream
This reverts commit 9425c591e06a9ab27a145ba655fb50532cf0bcc9
The reverted commit fixed up routines primarily used by readahead code
such that they could also be used by hugetlb. Unfortunately, this
caused a performance regression as pointed out by the Closes: tag.
The hugetlb code which uses page_cache_next_miss will be addressed in
a subsequent patch.
Link: https://lkml.kernel.org/r/20230621212403.174710-1-mike.kravetz@oracle.com
Fixes: 9425c591e06a ("page cache: fix page_cache_next/prev_miss off by one")
Signed-off-by: Mike Kravetz <mike.kravetz(a)oracle.com>
Reported-by: kernel test robot <oliver.sang(a)intel.com>
Closes: https://lore.kernel.org/oe-lkp/202306211346.1e9ff03e-oliver.sang@intel.com
Reviewed-by: Sidhartha Kumar <sidhartha.kumar(a)oracle.com>
Cc: stable(a)vger.kernel.org
Cc: Thomas Backlund <tmb(a)tmb.nu>
Cc: Ackerley Tng <ackerleytng(a)google.com>
Cc: Erdem Aktas <erdemaktas(a)google.com>
Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Cc: Matthew Wilcox <willy(a)infradead.org>
Cc: Muchun Song <songmuchun(a)bytedance.com>
Cc: Vishal Annapurve <vannapurve(a)google.com>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
As pointed out in [1], this patch was missed in the 6.4 stable tree.
Resending this patch with a Cc: stable.
[1]: https://lore.kernel.org/all/20230621212403.174710-1-mike.kravetz@oracle.com…
mm/filemap.c | 26 ++++++++++----------------
1 file changed, 10 insertions(+), 16 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 8abce63b259c9..a2006936a6ae2 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1760,9 +1760,7 @@ bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm,
*
* Return: The index of the gap if found, otherwise an index outside the
* range specified (in which case 'return - index >= max_scan' will be true).
- * In the rare case of index wrap-around, 0 will be returned. 0 will also
- * be returned if index == 0 and there is a gap at the index. We can not
- * wrap-around if passed index == 0.
+ * In the rare case of index wrap-around, 0 will be returned.
*/
pgoff_t page_cache_next_miss(struct address_space *mapping,
pgoff_t index, unsigned long max_scan)
@@ -1772,13 +1770,12 @@ pgoff_t page_cache_next_miss(struct address_space *mapping,
while (max_scan--) {
void *entry = xas_next(&xas);
if (!entry || xa_is_value(entry))
- return xas.xa_index;
- if (xas.xa_index == 0 && index != 0)
- return xas.xa_index;
+ break;
+ if (xas.xa_index == 0)
+ break;
}
- /* No gaps in range and no wrap-around, return index beyond range */
- return xas.xa_index + 1;
+ return xas.xa_index;
}
EXPORT_SYMBOL(page_cache_next_miss);
@@ -1799,9 +1796,7 @@ EXPORT_SYMBOL(page_cache_next_miss);
*
* Return: The index of the gap if found, otherwise an index outside the
* range specified (in which case 'index - return >= max_scan' will be true).
- * In the rare case of wrap-around, ULONG_MAX will be returned. ULONG_MAX
- * will also be returned if index == ULONG_MAX and there is a gap at the
- * index. We can not wrap-around if passed index == ULONG_MAX.
+ * In the rare case of wrap-around, ULONG_MAX will be returned.
*/
pgoff_t page_cache_prev_miss(struct address_space *mapping,
pgoff_t index, unsigned long max_scan)
@@ -1811,13 +1806,12 @@ pgoff_t page_cache_prev_miss(struct address_space *mapping,
while (max_scan--) {
void *entry = xas_prev(&xas);
if (!entry || xa_is_value(entry))
- return xas.xa_index;
- if (xas.xa_index == ULONG_MAX && index != ULONG_MAX)
- return xas.xa_index;
+ break;
+ if (xas.xa_index == ULONG_MAX)
+ break;
}
- /* No gaps in range and no wrap-around, return index beyond range */
- return xas.xa_index - 1;
+ return xas.xa_index;
}
EXPORT_SYMBOL(page_cache_prev_miss);
--
2.41.0
The patch below does not apply to the 6.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.4.y
git checkout FETCH_HEAD
git cherry-pick -x 05f933d5f7318b03ff2028c1704dc867ac16f2c7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2023072154-animal-dropkick-6a92@gregkh' --subject-prefix 'PATCH 6.4.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 05f933d5f7318b03ff2028c1704dc867ac16f2c7 Mon Sep 17 00:00:00 2001
From: Christophe JAILLET <christophe.jaillet(a)wanadoo.fr>
Date: Tue, 4 Jul 2023 21:50:28 +0200
Subject: [PATCH] i2c: nomadik: Remove a useless call in the remove function
Since commit 235602146ec9 ("i2c-nomadik: turn the platform driver to an amba
driver"), there is no more request_mem_region() call in this driver.
So remove the release_mem_region() call from the remove function which is
likely a left over.
Fixes: 235602146ec9 ("i2c-nomadik: turn the platform driver to an amba driver")
Cc: <stable(a)vger.kernel.org> # v3.6+
Acked-by: Linus Walleij <linus.walleij(a)linaro.org>
Reviewed-by: Andi Shyti <andi.shyti(a)kernel.org>
Signed-off-by: Christophe JAILLET <christophe.jaillet(a)wanadoo.fr>
Signed-off-by: Wolfram Sang <wsa(a)kernel.org>
diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index 1e5fd23ef45c..212f412f1c74 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -1038,7 +1038,6 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
static void nmk_i2c_remove(struct amba_device *adev)
{
- struct resource *res = &adev->res;
struct nmk_i2c_dev *dev = amba_get_drvdata(adev);
i2c_del_adapter(&dev->adap);
@@ -1047,7 +1046,6 @@ static void nmk_i2c_remove(struct amba_device *adev)
clear_all_interrupts(dev);
/* disable the controller */
i2c_clr_bit(dev->virtbase + I2C_CR, I2C_CR_PE);
- release_mem_region(res->start, resource_size(res));
}
static struct i2c_vendor_data vendor_stn8815 = {