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Message-ID: <alpine.DEB.2.21.1904191009040.3174@nanos.tec.linutronix.de>
Date: Fri, 19 Apr 2019 10:18:43 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: Pingfan Liu <kernelfans@...il.com>
cc: linux-kernel@...r.kernel.org, Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Tony Luck <tony.luck@...el.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Ralf Baechle <ralf@...ux-mips.org>,
Paul Burton <paul.burton@...s.com>,
James Hogan <jhogan@...nel.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Rich Felker <dalias@...c.org>, Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Julien Thierry <julien.thierry@....com>,
Palmer Dabbelt <palmer@...ive.com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
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Johannes Weiner <hannes@...xchg.org>,
David Hildenbrand <david@...hat.com>,
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Hari Bathini <hbathini@...ux.ibm.com>,
Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
Yangtao Li <tiny.windzz@...il.com>,
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x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
linux-sh@...r.kernel.org
Subject: Re: [PATCH] kernel/crash: make parse_crashkernel()'s return value
more indicant
On Fri, 19 Apr 2019, Pingfan Liu wrote:
> At present, both return and crash_size should be checked to guarantee the
> success of parse_crashkernel().
> Simplify the way by returning negative if fail, positive if success. In
> case of failure, -EINVAL for bad syntax, -1 for the parsing results in
> crash_size=0.
I'm not entirely sure what you are trying to say here, but '-1' is not an
improvement at all. We surely are not short of proper error codes, right?
Also I don't see any positive return value > 0. So what is this about:
> --- a/arch/ia64/kernel/setup.c
> +++ b/arch/ia64/kernel/setup.c
> @@ -277,7 +277,7 @@ static void __init setup_crashkernel(unsigned long total, int *n)
>
> ret = parse_crashkernel(boot_command_line, total,
> &size, &base);
> - if (ret == 0 && size > 0) {
> + if (ret >= 0) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^ ????
> if (!memory_region_available(crash_base, crash_size)) {
> diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
> index 45a8d0b..0b626e2 100644
> --- a/arch/powerpc/kernel/fadump.c
> +++ b/arch/powerpc/kernel/fadump.c
> @@ -376,7 +376,7 @@ static inline unsigned long fadump_calculate_reserve_size(void)
> */
> ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
> &size, &base);
> - if (ret == 0 && size > 0) {
> + if (ret >= 0) {
and this ?
> unsigned long max_size;
>
> if (fw_dump.reserve_bootvar)
> diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
> index 63f5a93..9f3e61a 100644
> --- a/arch/powerpc/kernel/machine_kexec.c
> +++ b/arch/powerpc/kernel/machine_kexec.c
> @@ -122,7 +122,7 @@ void __init reserve_crashkernel(void)
> /* use common parsing */
> ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
> &crash_size, &crash_base);
> - if (ret == 0 && crash_size > 0) {
> + if (ret >= 0) {
Again.
> crashk_res.start = crash_base;
> crashk_res.end = crash_base + crash_size - 1;
> }
> --- a/arch/sh/kernel/machine_kexec.c
> +++ b/arch/sh/kernel/machine_kexec.c
> @@ -157,7 +157,7 @@ void __init reserve_crashkernel(void)
>
> ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
> &crash_size, &crash_base);
> - if (ret == 0 && crash_size > 0) {
> + if (ret >= 0) {
And some more.
> crashk_res.start = crash_base;
> crashk_res.end = crash_base + crash_size - 1;
> }
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 3d872a5..62d07d4 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -526,11 +526,11 @@ static void __init reserve_crashkernel(void)
>
> /* crashkernel=XM */
> ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
> - if (ret != 0 || crash_size <= 0) {
> + if (ret == -EINVAL) {
Without an explanation why this proceedes on error codes other than EINVAL
this is uncomprehensible. Comments exist for a reason.
> /* crashkernel=X,high */
> ret = parse_crashkernel_high(boot_command_line, total_mem,
> &crash_size, &crash_base);
> - if (ret != 0 || crash_size <= 0)
> + if (ret < 0)
> return;
> high = true;
> @@ -87,7 +87,7 @@ static int __init parse_crashkernel_mem(char *cmdline,
> cur = tmp;
> if (size >= system_ram) {
> pr_warn("crashkernel: invalid size\n");
> - return -EINVAL;
> + return -1;
Well, this is incomprehensible as well. The pr_warn() says invalid and then
you change the error code to something magic.
Thanks,
tglx
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