From: Matthias Brugger <mbrugger@suse.com>
To: Pavel Tatashin <pasha.tatashin@soleen.com>,
jmorris@namei.org, sashal@kernel.org, ebiederm@xmission.com,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
corbet@lwn.net, catalin.marinas@arm.com, will@kernel.org,
linux-arm-kernel@lists.infradead.org, marc.zyngier@arm.com,
james.morse@arm.com, vladimir.murzin@arm.com,
bhsharma@redhat.com, linux-mm@kvack.org, mark.rutland@arm.com
Subject: Re: [PATCH v4 05/17] arm64: hibernate: remove gotos in create_safe_exec_page
Date: Tue, 10 Sep 2019 10:21:08 +0200 [thread overview]
Message-ID: <9135be3e-cf7e-821d-928d-db98aa3ec9c8@suse.com> (raw)
In-Reply-To: <20190909181221.309510-6-pasha.tatashin@soleen.com>
On 09/09/2019 20:12, Pavel Tatashin wrote:
> Usually, gotos are used to handle cleanup after exception, but
> in case of create_safe_exec_page there are no clean-ups. So,
> simply return the errors directly.
>
While at it, how about also cleaning up swsusp_arch_resume() which has the same
issue.
Regards,
Matthias
> Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
> Reviewed-by: James Morse <james.morse@arm.com>
> ---
> arch/arm64/kernel/hibernate.c | 34 +++++++++++-----------------------
> 1 file changed, 11 insertions(+), 23 deletions(-)
>
> diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
> index 47a861e0cb0c..7bbeb33c700d 100644
> --- a/arch/arm64/kernel/hibernate.c
> +++ b/arch/arm64/kernel/hibernate.c
> @@ -198,7 +198,6 @@ static int create_safe_exec_page(void *src_start, size_t length,
> unsigned long dst_addr,
> phys_addr_t *phys_dst_addr)
> {
> - int rc = 0;
> pgd_t *trans_pgd;
> pgd_t *pgdp;
> pud_t *pudp;
> @@ -206,47 +205,37 @@ static int create_safe_exec_page(void *src_start, size_t length,
> pte_t *ptep;
> unsigned long dst = get_safe_page(GFP_ATOMIC);
>
> - if (!dst) {
> - rc = -ENOMEM;
> - goto out;
> - }
> + if (!dst)
> + return -ENOMEM;
>
> memcpy((void *)dst, src_start, length);
> __flush_icache_range(dst, dst + length);
>
> trans_pgd = (void *)get_safe_page(GFP_ATOMIC);
> - if (!trans_pgd) {
> - rc = -ENOMEM;
> - goto out;
> - }
> + if (!trans_pgd)
> + return -ENOMEM;
>
> pgdp = pgd_offset_raw(trans_pgd, dst_addr);
> if (pgd_none(READ_ONCE(*pgdp))) {
> pudp = (void *)get_safe_page(GFP_ATOMIC);
> - if (!pudp) {
> - rc = -ENOMEM;
> - goto out;
> - }
> + if (!pudp)
> + return -ENOMEM;
> pgd_populate(&init_mm, pgdp, pudp);
> }
>
> pudp = pud_offset(pgdp, dst_addr);
> if (pud_none(READ_ONCE(*pudp))) {
> pmdp = (void *)get_safe_page(GFP_ATOMIC);
> - if (!pmdp) {
> - rc = -ENOMEM;
> - goto out;
> - }
> + if (!pmdp)
> + return -ENOMEM;
> pud_populate(&init_mm, pudp, pmdp);
> }
>
> pmdp = pmd_offset(pudp, dst_addr);
> if (pmd_none(READ_ONCE(*pmdp))) {
> ptep = (void *)get_safe_page(GFP_ATOMIC);
> - if (!ptep) {
> - rc = -ENOMEM;
> - goto out;
> - }
> + if (!ptep)
> + return -ENOMEM;
> pmd_populate_kernel(&init_mm, pmdp, ptep);
> }
>
> @@ -272,8 +261,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
>
> *phys_dst_addr = virt_to_phys((void *)dst);
>
> -out:
> - return rc;
> + return 0;
> }
>
> #define dcache_clean_range(start, end) __flush_dcache_area(start, (end - start))
>
next prev parent reply other threads:[~2019-09-10 8:21 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-09 18:12 [PATCH v4 00/17] arm64: MMU enabled kexec relocation Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 01/17] kexec: quiet down kexec reboot Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 02/17] arm64: hibernate: pass the allocated pgdp to ttbr0 Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 03/17] arm64: hibernate: check pgd table allocation Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 04/17] arm64: hibernate: use get_safe_page directly Pavel Tatashin
2019-09-10 8:03 ` Matthias Brugger
2019-09-10 9:10 ` Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 05/17] arm64: hibernate: remove gotos in create_safe_exec_page Pavel Tatashin
2019-09-10 8:21 ` Matthias Brugger [this message]
2019-09-10 9:12 ` Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 06/17] arm64: hibernate: rename dst to page " Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 07/17] arm64: hibernate: add PUD_SECT_RDONLY Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 08/17] arm64: hibernate: add trans_pgd public functions Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 09/17] arm64: hibernate: move page handling function to new trans_pgd.c Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 10/17] arm64: trans_pgd: make trans_pgd_map_page generic Pavel Tatashin
2019-09-10 8:29 ` Matthias Brugger
2019-09-10 9:20 ` Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 11/17] arm64: trans_pgd: pass allocator trans_pgd_create_copy Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 12/17] arm64: trans_pgd: pass NULL instead of init_mm to *_populate functions Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 13/17] kexec: add machine_kexec_post_load() Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 14/17] arm64: kexec: move relocation function setup and clean up Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 15/17] arm64: kexec: add expandable argument to relocation function Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 16/17] arm64: kexec: configure trans_pgd page table for kexec Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 17/17] arm64: kexec: enable MMU during kexec relocation Pavel Tatashin
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