From: Markus Elfring <[email protected]> Date: Tue, 7 Nov 2017 08:51:00 +0100
Add a jump target so that a bit of exception handling can be better reused at the end of this function. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <[email protected]> --- v1 - Request for comments: I can offer another bit of information for a software development discussion. ๐ญ The affected source file can be compiled for the processor architecture โx86_64โ by a tool like โGCC 6.4.1+r251631-1.3โ from the software distribution โopenSUSE Tumbleweedโ with the following command example. my_cc=/usr/bin/gcc-6 \ && my_module=fs/nfs/write.o \ && for XYZ in 0 s 3; do echo " _____ $XYZ _____" \ && my_extra="-O$XYZ" \ && git checkout next-20171102 \ && make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS="${my_extra}" allmodconfig "${my_module}" \ && size "${my_module}" \ && git checkout ':/^nfs/write: Use common error handling code in nfs_lock_and_join_requests' \ && make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS="${my_extra}" allmodconfig "${my_module}" \ && size "${my_module}"; done ๐ฎ Do you find the following differences worth for further clarification? โโโโโโโโโโโคโโโโโโโ โ setting โ text โ โ โโโโโโโโโโชโโโโโโโฃ โ O0 โ ??? โ Compilation failure? โ Os โ -17 โ โ O3 โ -16 โ โโโโโโโโโโโงโโโโโโโ fs/nfs/write.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/fs/nfs/write.c b/fs/nfs/write.c index babebbccae2a..5b5f464f6f2a 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -487,10 +487,8 @@ nfs_lock_and_join_requests(struct page *page) } ret = nfs_page_group_lock(head); - if (ret < 0) { - nfs_unlock_and_release_request(head); - return ERR_PTR(ret); - } + if (ret < 0) + goto release_request; /* lock each request in the page group */ total_bytes = head->wb_bytes; @@ -515,8 +513,7 @@ nfs_lock_and_join_requests(struct page *page) if (ret < 0) { nfs_unroll_locks(inode, head, subreq); nfs_release_request(subreq); - nfs_unlock_and_release_request(head); - return ERR_PTR(ret); + goto release_request; } } /* @@ -532,8 +529,8 @@ nfs_lock_and_join_requests(struct page *page) nfs_page_group_unlock(head); nfs_unroll_locks(inode, head, subreq); nfs_unlock_and_release_request(subreq); - nfs_unlock_and_release_request(head); - return ERR_PTR(-EIO); + ret = -EIO; + goto release_request; } } @@ -576,6 +573,10 @@ nfs_lock_and_join_requests(struct page *page) /* still holds ref on head from nfs_page_find_head_request * and still has lock on head from lock loop */ return head; + +release_request: + nfs_unlock_and_release_request(head); + return ERR_PTR(ret); } static void nfs_write_error_remove_page(struct nfs_page *req) -- 2.15.0
