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writeback: use |1 instead of +1 to protect against div by zero
mm/page-writeback.c has several places where 1 is added to the divisor
to prevent division by zero exceptions; however, if the original
divisor is equivalent to -1, adding 1 leads to division by zero.
There are three places where +1 is used for this purpose - one in
pos_ratio_polynom() and two in bdi_position_ratio(). The second one
in bdi_position_ratio() actually triggered div-by-zero oops on a
machine running a 3.10 kernel. The divisor is
x_intercept - bdi_setpoint + 1 == span + 1
span is confirmed to be (u32)-1. It isn't clear how it ended up that
but it could be from write bandwidth calculation underflow fixed by
c72efb658f
("writeback: fix possible underflow in write bandwidth
calculation").
At any rate, +1 isn't a proper protection against div-by-zero. This
patch converts all +1 protections to |1. Note that
bdi_update_dirty_ratelimit() was already using |1 before this patch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -580,7 +580,7 @@ static long long pos_ratio_polynom(unsigned long setpoint,
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long x;
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x = div64_s64(((s64)setpoint - (s64)dirty) << RATELIMIT_CALC_SHIFT,
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limit - setpoint + 1);
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(limit - setpoint) | 1);
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pos_ratio = x;
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pos_ratio = pos_ratio * x >> RATELIMIT_CALC_SHIFT;
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pos_ratio = pos_ratio * x >> RATELIMIT_CALC_SHIFT;
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@ -807,7 +807,7 @@ static unsigned long bdi_position_ratio(struct backing_dev_info *bdi,
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* scale global setpoint to bdi's:
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* bdi_setpoint = setpoint * bdi_thresh / thresh
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*/
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x = div_u64((u64)bdi_thresh << 16, thresh + 1);
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x = div_u64((u64)bdi_thresh << 16, thresh | 1);
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bdi_setpoint = setpoint * (u64)x >> 16;
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/*
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* Use span=(8*write_bw) in single bdi case as indicated by
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@ -822,7 +822,7 @@ static unsigned long bdi_position_ratio(struct backing_dev_info *bdi,
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if (bdi_dirty < x_intercept - span / 4) {
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pos_ratio = div64_u64(pos_ratio * (x_intercept - bdi_dirty),
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x_intercept - bdi_setpoint + 1);
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(x_intercept - bdi_setpoint) | 1);
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} else
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pos_ratio /= 4;
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