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From e7bb07ee7b499f71990e9e83596bdb2ddabdd4cd Mon Sep 17 00:00:00 2001
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Message-Id: <e7bb07ee7b499f71990e9e83596bdb2ddabdd4cd.1489676829.git.panand@redhat.com>
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In-Reply-To: <f85183096d31d865c97565614535d84943b12908.1489676829.git.panand@redhat.com>
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References: <f85183096d31d865c97565614535d84943b12908.1489676829.git.panand@redhat.com>
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From: AKASHI Takahiro <takahiro.akashi@linaro.org>
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Date: Wed, 15 Mar 2017 18:38:16 +0900
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Subject: [PATCH 02/10] kexec: exntend the semantics of
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kexec_iomem_for_each_line
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The current kexec_iomem_for_each_line() counts up all the lines for which
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a callback function returns zero(0) or positive, and otherwise it stops
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further scanning.
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This behavior is incovenient in some cases. For instance, on arm64, we want
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to count up "System RAM" entries, but need to skip "reserved" entries.
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So this patch extends the semantics so that we will continue to scan
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succeeding entries but not count lines for which a callback function
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returns positive.
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The current users of kexec_iomem_for_each_line(), arm, sh and x86, will not
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be affected by this change because
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* arm
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The callback function only returns -1 or 0, and the return value of
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kexec_iomem_for_each_line() will never be used.
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* sh, x86
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The callback function may return (-1 for sh,) 0 or 1, but always returns
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1 once we have reached the maximum number of entries allowed.
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Even so the current kexec_iomem_for_each_line() counts them up.
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This change actually fixes this bug.
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Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
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---
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kexec/kexec-iomem.c | 15 ++++++++++-----
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1 file changed, 10 insertions(+), 5 deletions(-)
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diff --git a/kexec/kexec-iomem.c b/kexec/kexec-iomem.c
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index 485a2e810080..0a0277a422d8 100644
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--- a/kexec/kexec-iomem.c
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+++ b/kexec/kexec-iomem.c
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@@ -18,6 +18,9 @@
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* Iterate over each line in the file returned by proc_iomem(). If match is
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* NULL or if the line matches with our match-pattern then call the
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* callback if non-NULL.
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+ * If match is NULL, callback should return a negative if error.
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+ * Otherwise the interation goes on, incrementing nr but only if callback
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+ * returns 0 (matched).
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*
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* Return the number of lines matched.
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*/
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@@ -37,7 +40,7 @@ int kexec_iomem_for_each_line(char *match,
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char *str;
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int consumed;
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int count;
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- int nr = 0;
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+ int nr = 0, ret;
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fp = fopen(iomem, "r");
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if (!fp)
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@@ -50,11 +53,13 @@ int kexec_iomem_for_each_line(char *match,
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str = line + consumed;
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size = end - start + 1;
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if (!match || memcmp(str, match, strlen(match)) == 0) {
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- if (callback
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- && callback(data, nr, str, start, size) < 0) {
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- break;
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+ if (callback) {
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+ ret = callback(data, nr, str, start, size);
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+ if (ret < 0)
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+ break;
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+ else if (ret == 0)
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+ nr++;
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}
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- nr++;
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}
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}
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--
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2.9.3
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