linux-kernel - Re: [PATCH 2/2] RAS: Introduce the FRU Memory Poison Manager

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Message-ID: <20240214201021.GQZc0eLX1AXV-PwE1K@fat_crate.local>
Date: Wed, 14 Feb 2024 21:10:21 +0100
From: Borislav Petkov <bp@...en8.de>
To: Yazen Ghannam <yazen.ghannam@....com>
Cc: tony.luck@...el.com, linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org, avadhut.naik@....com,
	john.allen@....com, muralidhara.mk@....com,
	naveenkrishna.chatradhi@....com, sathyapriya.k@....com
Subject: Re: [PATCH 2/2] RAS: Introduce the FRU Memory Poison Manager

On Wed, Feb 14, 2024 at 10:26:41AM -0500, Yazen Ghannam wrote:
> > > +static bool is_valid_fmp(struct fru_rec *rec)
> > 
> > fmp_is_valid()
> > 
> 
> Ack.

diff --git a/drivers/ras/amd/fmpm.c b/drivers/ras/amd/fmpm.c
index bcee828cb916..3600bf0dca53 100644
--- a/drivers/ras/amd/fmpm.c
+++ b/drivers/ras/amd/fmpm.c
@@ -447,7 +447,7 @@ static int save_new_records(void)
 	return ret;
 }
 
-static bool is_valid_fmp(struct fru_rec *rec)
+static bool fmp_is_valid(struct fru_rec *rec)
 {
 	struct cper_sec_fru_mem_poison *fmp = &rec->fmp;
 	u32 len = get_fmp_len(rec);
@@ -486,19 +486,12 @@ static bool is_valid_fmp(struct fru_rec *rec)
 	return true;
 }
 
-static void restore_record(struct fru_rec *new, struct fru_rec *old)
-{
-	/* Records larger than max_rec_len were skipped earlier. */
-	size_t len = min(max_rec_len, old->hdr.record_length);
-
-	memcpy(new, old, len);
-}
-
 static bool valid_record(struct fru_rec *old)
 {
 	struct fru_rec *new;
+	size_t len;
 
-	if (!is_valid_fmp(old)) {
+	if (!fmp_is_valid(old)) {
 		pr_debug("Ignoring invalid record");
 		return false;
 	}
@@ -509,8 +502,11 @@ static bool valid_record(struct fru_rec *old)
 		return false;
 	}
 
-	/* What if ERST has duplicate FRU entries? */
-	restore_record(new, old);
+	/* Records larger than max_rec_len were skipped earlier. */
+	len = min(max_rec_len, old->hdr.record_length);
+
+	/* Restore the record */
+	memcpy(new, old, len);
 
 	return true;
 }

-- 
Regards/Gruss,
    Boris.

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