linux-kernel - Re: [PATCH v7 4/9] ACPI: APEI: EINJ: Remove redundant calls to einj_get_available_error

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Message-ID: <aBzwpS6t3V4zwrxn@zaid-VirtualBox>
Date: Thu, 8 May 2025 10:57:57 -0700
From: Zaid Alali <zaidal@...amperecomputing.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: lenb@...nel.org, james.morse@....com, tony.luck@...el.com, bp@...en8.de,
	robert.moore@...el.com, Jonathan.Cameron@...wei.com,
	ira.weiny@...el.com, Benjamin.Cheatham@....com,
	dan.j.williams@...el.com, arnd@...db.de, Avadhut.Naik@....com,
	u.kleine-koenig@...gutronix.de, john.allen@....com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	acpica-devel@...ts.linux.dev
Subject: Re: [PATCH v7 4/9] ACPI: APEI: EINJ: Remove redundant calls to
 einj_get_available_error_type

On Wed, May 07, 2025 at 01:34:35PM +0200, Rafael J. Wysocki wrote:
> On Tue, May 6, 2025 at 11:38 PM Zaid Alali
> <zaidal@...amperecomputing.com> wrote:
> >
> > A single call to einj_get_available_error_type in init function is
> > sufficient to save the return value in a global variable to be used
> > later in various places in the code. This commit does not introduce
> > any functional changes, but only removing unnecessary redundant
> > function calls.
> >
> > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> > Reviewed-by: Ira Weiny <ira.weiny@...el.com>
> > Signed-off-by: Zaid Alali <zaidal@...amperecomputing.com>
> 
> Does this patch depend on patches [1-3/7]?  If not, I can pick it up
> as an optimization.
Hi Rafael,

No, this patch is does not depend on 1-3 patches. You can pick it up!

-Zaid 

> 
> > ---
> >  drivers/acpi/apei/einj-core.c | 22 +++++++++-------------
> >  1 file changed, 9 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/acpi/apei/einj-core.c b/drivers/acpi/apei/einj-core.c
> > index 47abd9317fef..ada1d7026af5 100644
> > --- a/drivers/acpi/apei/einj-core.c
> > +++ b/drivers/acpi/apei/einj-core.c
> > @@ -83,6 +83,8 @@ static struct debugfs_blob_wrapper vendor_blob;
> >  static struct debugfs_blob_wrapper vendor_errors;
> >  static char vendor_dev[64];
> >
> > +static u32 available_error_type;
> > +
> >  /*
> >   * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
> >   * EINJ table through an unpublished extension. Use with caution as
> > @@ -662,14 +664,9 @@ static struct { u32 mask; const char *str; } const einj_error_type_string[] = {
> >
> >  static int available_error_type_show(struct seq_file *m, void *v)
> >  {
> > -       int rc;
> > -       u32 error_type = 0;
> >
> > -       rc = einj_get_available_error_type(&error_type);
> > -       if (rc)
> > -               return rc;
> >         for (int pos = 0; pos < ARRAY_SIZE(einj_error_type_string); pos++)
> > -               if (error_type & einj_error_type_string[pos].mask)
> > +               if (available_error_type & einj_error_type_string[pos].mask)
> >                         seq_printf(m, "0x%08x\t%s\n", einj_error_type_string[pos].mask,
> >                                    einj_error_type_string[pos].str);
> >
> > @@ -692,8 +689,7 @@ bool einj_is_cxl_error_type(u64 type)
> >
> >  int einj_validate_error_type(u64 type)
> >  {
> > -       u32 tval, vendor, available_error_type = 0;
> > -       int rc;
> > +       u32 tval, vendor;
> >
> >         /* Only low 32 bits for error type are valid */
> >         if (type & GENMASK_ULL(63, 32))
> > @@ -709,13 +705,9 @@ int einj_validate_error_type(u64 type)
> >         /* Only one error type can be specified */
> >         if (tval & (tval - 1))
> >                 return -EINVAL;
> > -       if (!vendor) {
> > -               rc = einj_get_available_error_type(&available_error_type);
> > -               if (rc)
> > -                       return rc;
> > +       if (!vendor)
> >                 if (!(type & available_error_type))
> >                         return -EINVAL;
> > -       }
> >
> >         return 0;
> >  }
> > @@ -791,6 +783,10 @@ static int __init einj_probe(struct platform_device *pdev)
> >                 goto err_put_table;
> >         }
> >
> > +       rc = einj_get_available_error_type(&available_error_type);
> > +       if (rc)
> > +               return rc;
> > +
> >         rc = -ENOMEM;
> >         einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
> >
> > --
> > 2.43.0
> >